Top definition
When a male has an erection that resembles having a unicorn horn in his pants.
Example 1: "Hey Don, check out unicorn pants over there leaving that strip club."

Example 2: "Michelle's mom came home when we were messing around downstairs. She asked for help bringing in the groceries and I had a major case of unicorn pants."
by -Kley- December 03, 2007
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