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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
More from Urban Dictionary

piddlefart

verb. To waste time doing nothing.
Instead of doing my homework, I decided to piddlefart around for two hours.
piddlefart by Rene April 25, 2005
Word of the Day on October 9, 2026
anyone who succeeds in disgracing/over indulging themselves in the throws of clubland
28 hours and 4 clubs later, gurning for england but still refusing to go home - a total wrongun!!
wrongun by bevvers March 21, 2007
Word of the Day on October 8, 2026

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
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