Refers to a state of gastrointestinal distress usually resulting in premature defecation; unwittingly shitting on the toilet, not in it.
While donuts make me go nuts, Timbits give me rim shits.
by Chunk Rousseau February 04, 2011
The act of doing a rimshot.
(while bragging) Man, did you hear how I rimshitted after that joke?
by Jordan Zonic April 21, 2005