a girl's preoccupation with sex after she has had sex with someone who is really good
the feeling you get after you have seen a really huge cock
Girl 1: OMG! I can't stop thinking about Marcus. He fucked me so good last night!
Girl 2: Damn girl! You are totally cockstruck!
Lady 1: Holy shit! Halen's cock is huge! He showed it to me last night and I almost fainted.
Lady 2: Sounds like you were cockstruck.
The female equivalent of being "pussy whipped" wherein a girl is so attached to her man that she will bow down to his every whim.
Jen is so cockstruck she did David's laundry, let him hang out when she had a test the next morning, attended his officer ceremony, and now she's letting him cop out on her 21st birthday because of a football game.