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1.
Engaging in a threesome with a bi-curious secret service agent
The wife and I just pounded the ass off our off-duty security detail. It was a raging hot threechum.
by doctor mantis toboggan April 16, 2014
 
2.
THREECHUM: Three friends or "CHUMS" that do something together. Movie, Dinner, Club, Casino, just hang out whatever you want it to be...
"hey babe, i'm going out tonight for a THREECHUM with Justin and Alex at the bowling alley"

"I had to cancel my double date because I was called into work, so my girl is going for a THREECHUM movie night"
by LuvmyH3 January 30, 2012