Slip Cup 

A drinking game combining a slip n slide and flip cup in a wildly entertaining competition of college drinking.

"Ayy, let's play a round of slip cup. It's hot outside."

Slip Cup by Casadyday July 3, 2015

many a slip between the cup and the lip 

Generally refers to a situation where things did not happen at the last minute the way they were expected to due to unforseen reasons

I was to get a raise this year, but it didnt happen due to the merger.
Well my friend, there is many a slip between the cup and the lip!

many a slip between the cup and the lip by Vishal Dhaliwal September 22, 2006

slipcup 

A slipping of the cup used to protect the testicles caused by not being held in place due to the smallness of the testicles.

Frank was kneed in the balls in football due to a slipcup.

slipcup by Alucard721.5 July 14, 2007