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When a guy and a girl are having sex, and the guy likes to look at her pictures online, to keep him "in the mood" and remind him that she's WAY hotter online than in real life.
So how was Laura Diggelhoop last night?
Dude, I had to have fex with her!
by peachykeane December 07, 2009
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8
When you fuck a girl in the lake while fishing
girl: u wanna go have fex
Me: hell yeah, I love me some good ol fish n fuck

Girl: Im getting a little freaky uhhhhhhhhhhhhhh
by Dubiks December 25, 2018
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10
A fight that happens while having sex.
Jeremy and I were totally going at it when I mentioned something I had no idea would start a fex; I didn't realize how mad he was until he lost his boner.
by themerm8 February 13, 2008
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11
acronym: Future EX (boyfriend/girlfriend)
OMG that guy is SOOO guna be my new FEX
by bunbuzz October 22, 2009
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12
To have Facebook sex; i.e. engaging in and having conversations with an attractive male or female over Facebook. Also, any flirtatious interactions between two members of the opposite or the same sex via said social networking site.
"Dude that chick's profile pic is so hot. We're totally going to fex tonight."

"I just fexed with Johnny! Maybe he'll ask me to Prom now."

"He's a fexer; we fexed over Facebook Chat earlier today."
by ReginaAlice December 01, 2009
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13
Mischievous yet genious Counter-strike player. Co-founder of Legendary "Stonecutters" clan.

Also known as "SC2-FeX"
Holy Shit! FeX is playin' on my server!
by Smith, John December 02, 2003
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