Present tense contraction for "intramuscular" IM; as opposed to IV (intravenous) or SL (sublingual) : In reference to drugs and medications; a route of administration.
benjabean1: hello
benjabean1: hello
benjabean1: how are you?
benjabean1: how are you?
benjabean1: fine thanks, how are you?
benjabean1: fine thanks, how are you?
Person walks by, looks at screen, "Dude, stop iming yourself!"
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.