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Getting your hopes up. It's also called an unwanted mental erection, when you get your hopes up, but have a really hard time trying to bring them back down. Like an erection in public.
A: "He's so cute! I think he was flirting with me in science."
B: "You sure?"
A: "Fuckin' mental erections"
by SparklyBoy September 15, 2011
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1.n.a feeling of bliss in your head when you connect with somebody in a way you never connected before 2.n. feeling of an erection except for mentally not physically
man when i was talking to that girl a couple nights ago we just connected i got a mental erection.
by godking superdum November 09, 2009
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