What is Flip Up?
1.
the classic hair style of the late 90's in which the bangs of the hair are made to stand up; which then evolved into the "blow out" which is now used by virtually all people who go clubbing
Hey wanna go play soccer? Yeah, just got my new flip up.
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2.
To have an erection and attempt to disguise it by flipping your penis upwards -- so it is held between you underwear/pants and you waistline.
My teacher asked me to stand up in class, I had a huge boner so I needed to flip up quickly before I stood.
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