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1.
Basically where someone leads you on, fucks you and then never talks to you again. A hit and diss would leave the person crying and heartbroken.
Boy: Hey baby you're beautiful, let's hook up
*Boy && girl hook up and then he never talks to her again*
Girl: I feel so stupid, that was such a hit and diss.

And vice versa.
by fagtitties September 09, 2013