Top Definition
The act where a male flexes his penis or, in other words, "contracts" his penis. This action usually occurs when the male is semi-errect or completly errect.
1. Lenny's meatflex was so good it looked like his penis was waving at me from across the room.

2. Lenny meatflexed in gym class and impressed all the girls.

3. The meatflexing continued all day due to an overdose of Viagra.
by The Jayman September 14, 2006

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