Adj. The combination of frustrated and horny; the feeling of sexual frustration when one desperately needs to have sex or masturbate. Commonly felt by single people who haven't had sex in a while.
I haven't wanked in a week and I'm getting all frusty.
Sharon was so frusty last night, she was rubbing up on Michael the whole time!
Poor Nicole must be frusty, she's been relating everything to sex lately.
I don't understand... you have a boyfriend but you still feel frusty?
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adj. Big Flirt. Can refer to both male and female
Did you see Nora all over that guy last night. She was acting like a major frusty!
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NOUN: A frustrated person.
You look like a frusty.
Hey! frusty! let's go!
That dude is a frusty.