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1.
when someone has sex with someone with no intentions by them.

has sex with them (buck) then ignores/doesn't speak to/doesn't see again (chuck)
michael: "you had sex with her last night?"
paul: "yea but she was just a buck and chuck!"

or

louise: "im so pissed off, I actually liked him but I was just a buck and chuck"
by blemmah March 11, 2012