Ever gotten a message where someone says “ISTG” and you had no idea if they were angry, joking, or threatening your existence? 😂
You’re not alone — the first time I saw “ISTG,” I thought it was some type of secret code. Turns out, it’s actually one of the most dramatic (but common) slang phrases used online.
Here’s what ISTG really means and how people use it.
Quick Answer:
ISTG means “I Swear To God.”
It’s used to express strong emotion — frustration, excitement, honesty, annoyance, or emphasis.
What Does ISTG Mean in Text?
ISTG = I Swear To God
People use it to show they’re being serious or emotional about what they’re saying. Depending on the tone, it can be funny, dramatic, or even a little aggressive.
Example:
“istg if he cancels again I’m done 😭”
In short: ISTG = I Swear To God = expressing strong feelings or seriousness.
Where Is ISTG Commonly Used?
You’ll see ISTG everywhere Gen Z hangs out:
- 📱 Text messages
- 💬 Snapchat
- 📸 Instagram DMs
- 🔥 TikTok comments
- 🎮 Gaming chats
- 📩 Discord
It’s casual, dramatic, emotional, and definitely not formal.
Examples of ISTG in Conversation
Here are real-style chat examples:
A: “u ate all the fries??”
B: “istg it wasn’t me 😭😭”
A: “bro why you late again?”
B: “istg my alarm didn’t ring 😭”
A: “he texted u back??”
B: “istg YESSS 😭💀”
A: “stop lying omg”
B: “istg I’m telling the truth 😤”
A: “u better be here at 6”
B: “istg I will, chill 😭”
When to Use and When Not to Use ISTG
✅ When to Use
- To show you’re serious
- When you’re frustrated
- When joking dramatically
- When something unbelievable happens
- When emphasizing honesty
❌ When NOT to Use
- Business messages
- School/professional emails
- Serious or sensitive topics
- With authority figures
- When politeness matters
Comparison Table
| Context | Example Phrase | Why It Works |
|---|---|---|
| Friend Chat | “istg ur so annoying 😂” | Casual & playful |
| Work Chat | “I assure you I’ll deliver it.” | Professional tone |
| “I can confirm the details here.” | Formal & respectful |
Similar Slang Words or Alternatives
| Slang | Meaning | When to Use |
|---|---|---|
| FR | For real | Casual, agreeing strongly |
| Deadass | Completely serious | Strong emphasis, funny or serious |
| I swear | Being honest | Everyday casual speech |
| No cap | No lie | Gen-Z honesty slang |
| On God | I promise / for real | Strong emphasis, dramatic tone |
FAQs About ISTG
What does ISTG mean in texting?
It means “I Swear To God,” used to show seriousness or strong emotion.
Is ISTG rude?
It can be if used aggressively, but with friends it’s often dramatic or funny.
Is ISTG the same as FR?
Not exactly. FR means “for real,” while ISTG expresses stronger emotion.
Is ISTG appropriate for school or work?
No — it’s too informal and emotional.
How do I reply to ISTG?
You can respond casually:
“lol okay chill” or “I believe you 😂”
Final Thoughts
ISTG is one of the most expressive slang terms online. Whether someone’s frustrated, excited, or joking dramatically, ISTG helps intensify whatever they’re feeling.
It’s perfect for casual chats with friends — just keep it far away from teachers, emails, or professional messages.
