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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
Related Words

SitBacker 

A very distinct type of individual who tends to sit far back on the toilet seat when shitting, often times leaving fecal crumbs on the back of the toilet seat. The SitBacker signature is characterized by a V shaped doo doo crumb pattern, produced by the combination of the squashing of ass cheeks on the toilet seat, and the ass crack.
Damn that SitBacker!! There's shit on the seat, and its the only stall open!!!FUUUCCCCKKKK!
SitBacker by beachgoer716 November 5, 2009
A highly intelligent being that lives on a different plane of being and sits at 50 mph
Person 1: OMG LOOK IT'S THE ONE AND ONLY SITBIT
Person 2:I wish i could sit that fast
Sitbit by Standbit December 11, 2020

The Sitback

That part of when you're out eating at a restaruant and you start to feel full, but you aren't completely finished eating. To cure this, you sit back in your chair and wait for a minute or two before you go back to eating.
Ted: *Burrrrp* Man I'm feeling full but I still have half a burger...

Carl: Just do The Sitback, you'll feel better in a minute.
The Sitback by sXe vGe September 7, 2010
an acronym that stands for "sarcasm is to be sensed." used at the end of a text message to denote sarcasm, as it can be difficult to tell at times.
Really? I thought you liked working double shifts. sitbs
sitbs by sneakyweasel56 May 21, 2011
when your going to do so something
We sitby cronin everyday
sitby by Tom and Pat January 28, 2004