Top definition
1.) Engaging in or planning to engage in a threesome between two male roommates and a female.

2.) The act of a Mercedes Dream
1.) Oh man, I just walked in on those guys down the hall having a Mercedes Dream with my roommate!

2.) "Hey man, is it okay to cross swords during a Mercedes Dream?" "As long as you don't look me in the eye, dude."
by mcdreamlover May 23, 2010
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