Top Definition
The tell-tale grin one gets while IM-ing at work or in class. This grin tends to incriminate the IM-er and lets others know that they aren't staying on task or paying attention.
"OMG, LMFAO. Stop it - I've got the worst IM grin and my boss just walked by"
by effchomsky November 19, 2007
5 Words related to IM grin

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