sit on it
Also found in: Acronyms.
sit on it
An exclamation of frustration directed at another person. Popularized by the TV show Happy Days. If he thinks he can call at this hour of the night, he can sit on it! Sit on it, Joe—I'm not helping you with this!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.