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1.
Freeze Up means "to stop" or in other words "chill out"
Eze: a wass gud shawty
Patience:Freeze up talkin 2 me n***a
Eze:lol I'm Just playin...
by Tunde A.K.A. The Truth June 23, 2008
 
2.
when you are called on in class to answer a question you dont know and freeze because you were slacking off or sleeping
dude: hey man what happened to you in class today when the teacher picked on you?

other dude: sorry i was taking my after lunch nap and had a freeze up
by fairytailmaster April 25, 2011