boink fest
Noun: Sexual encounter; could possibly mean an orgy. From boink.
"What she needs is a good, healthy boink fest"-Cher Horowitz (Alicia Silverstone), "Clueless"
boink-fest
A sustained session of boinking. Such as a few boinks in one evening.
Tom and I had a boink-fest last eve. 5 times in one night!