Originating as space lingo or slang, the word crewtack can be used as an exclamatory word when excited or angered. Crewtack can also be replaced with the word "fuck" or "shit".
a female or tranny that waits for ships to come into port and thenproceeds to get on their back for the crew
Shelb: Have you seen Marcy anywhere?
Alex: Nah, man. I think the USS Abraham Lincoln is in port, she said something about looking at the boats
Shelb: ...fuckin' crewback