idrm is a misspelling of, "idrk" which means "I don't really know." This misspelling came into play because the letters 'k' and 'm' are close to each other on most keyboards, making is irresistible for most fools to make the mistake.
"Dude, how do you do calculus again?"
"idrm man, idrm."
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Extended version of IDR, "I dont remember".
Tim: Where did you put the box of food.
Bob: Might be in the kitchen but idrm.
Tim: Damn that reads better than Idr...
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