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1.
Rejection (of a male) by a girl who's a stealth-lesbian. Derived from the Weezer song.
"So how'd it go with that girl at the Dresden Dolls concert last night?"
"Shitty, man. We had fun, but I got totally pink triangled."

"I'm dumb, she's a lesbian. I thought I had found the one. I guess I got pink triangled."
by TOSG February 10, 2010
 
2.
When a guy falls for a female only to then find out she is lesbian. This is especially the case when the chemistry between the pair in question is seemingly quite strong.
Devon: Yeah so after she took me out to china town for lunch, studying in her room, and doing a yoga class together...she told me she was a lesbian.
Arthur: That's harsh man
Devon: I was totally pink triangled! I haven't felt this close to a girl in years!
by Zeke63 June 28, 2013