When someone texts you something with, "Ig", you may think they are mentally ill, or they didn't finish saying "Igloo" for some odd reason. Actually, they mean, "I guess", because nobody has time to say, "I guess".
Dude: I tried to hit on Sue but she igged me and just walked away.
Other Dude: So?
Chat room dude: If you continue using caps and that huge font you're gonna be igged.
Chat room asshole: FUCK YOU BITCH!!
Chat room dude: That's it. Now you're igged.