Top Definition
The act of being "best friends" with someone of the opposite gender and having a romantic relationship without actually making a commitment to one another.
Sort of like "sex buddies" for middle schoolers. Or a "one night stand" for an extended period of time.
Friend of one of the two peoples involved- "Hey are you two dating?"
Both- "No, we're just best friends with benefits."
by Tyler McKinlen September 21, 2011

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