Can be a noun and verb bass upon context.
The act of your asshole uncontrollably
quivering to hold back an explosive, juicy, wet, diarrhea-filled colon. The reason it is
quivering is usually from extreme beer drinking and not wanting to hit the bathroom until the last minute. Or, when you first get up
in the morning and you just have to hold the quivering back until you just can’t wait any longer.