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Black slang for your day was just ruined. Can also be used as a joke for someone that usually says stupid but funny.
A: ...and he then he caused all this shit up.
B: He really blows mine.

A: I heard Ms. C gave you detention.
B: I know, she just blew mine.

A: Yo this homework is blowing mine.

A: -some joke-
C: -to person B- LOL yoo this bitch is blowing mine!
by kiwishiiiit February 21, 2010
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