Top Definition
Acronym: Snickering In The Back Of My Mind.

!.) Typically used in text and/or chat when one finds something amusing but does not actually laugh out loud

2.) Can be used to inform a friend that their joke was short of funny, or even not funny at all.
Ralph: Did you hear the one about the sidewalk?

Sam: Um... no I guess not.

Ralph: Its all over town.

Sam (with blank expression): Sitbomm
by Big Mean Pappa Bear June 08, 2013

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