1.) The last bit of time that peninosaurs walked the earth.
2.) A scab-like period, in which the poor girl bleeds clotted blood wads, that are...you guessed it... "crusty."
"Her Crustaceous period, caused her to bleed even more, as it cut her insides"
LISTEN HERE YOU CRUSTACEOUS CHEAPSKATE, SQUIDWARD'S BEEN LIVING IN MY HOUSE DRIVING ME CRAZY AND YOU'RE NOT GONNA HIRE HIM BACK ALL BECAUSE OF A STUPID DIME?
when you have sex and your intercourse partner cums on you're vaginal area and you forget to clean up and it dries up and stays on your vagina and it hardens into a crust
tabitha: omg i got so drunk last night i woke up with vagina crustaceans
12 step recovery jargon referring to someone new who talks about how great life is, now that they're sober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.