Acronym. Stands for "If you know what I mean". Mainly used in instant messaging conversations. Can also be used in conjunction with "AITYD" (and I think you do).
"I could really go for a tossed salad for lunch."
"Oh, I've got a salad for you to toss, IYKWIM...AITYD."
these abbreviations sure are getting ridiculously long IYKWIMAITYD...
yeah... 'btw', you're a FUCKING Retard
Ohhhh i think you can get it harder than that sonny... iYKwIM ;)
