Lezzing it up refers the act of dressing, speaking or showing mannerisms attributed to lesbians.
Example 1 -

Friend #1: Did you see those army boots Lisa wore to the party?

Friend #2: Yeah, she was really lezzing it up.

Example 2 -

Friend: I think Caroline would be hot if she didn't lezz it up all the time.
by kalikolyst May 11, 2010
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to engage in lesbianism, two birds get busy
did u see those birds in big brother, they lezzed up!
by blazz July 7, 2005
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When two (or more) members of the same sex (including males) who consider themselves straight perform a sexual act to attract attention to themselves.
Look at those two girls over there lezzing up to get the attention of those men, what sluts!

Justin and Harry lezzed up in The Locomotive last night, they were well pissed, it was funny.
by robuttt January 15, 2007
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