Short for in your mom. Usually used for shit talking among friends in text messages
Sally : dude where are you.
Dave : I'm IYM right now. I'll be done in a minute just chill
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A way of changing the subject in text messaging, usually written out as a word, not the symbol (\).
Gee Mary, I'm sorry to hear your mother died. Slash, hey why don't you come over tonight and look at my etchings?
Any terrible video link your friend sends you, usually involving Marjorie Taylor Green
Your friend : dude check out this video of Marjorie Taylor Green on Fox News.
You : I don't watch your shitteos.