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To send flirtatious texts to somebody aka spitting game via text messages. Came from the words text and the words flirt and flex.

Pronounced - ef-el-ex-ing or flexing.

*Warning* Can lead to sexting.
Chiller: Dude are you still texting that chick?
Barney: Yeah, I'm tell her about how much I like her new hair color and how much I can bench.
Chiller: Your totally flxing man.
by Anonfourtwenty June 14, 2011
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