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A phrase used as an expression of shock or disbelief. Usually used in unusual circumstances in which one may be skeptical that the speaker has been heard correctly.
example 1.]

Girl #1: What?!? Lisa's dating Drake?? Comb that back!
Girl #2: mmhmm girl no lie!

Example 2.]

Boy: Wait! Comb that back! How much did you say that ring cost??
Girl: Come on! it's not THAT much
by Liviea July 08, 2009