adj. Suitable or desirable for screwing (sexual intercourse); fuckable.
The Century Dictionary and Cyclopedia
Capable of being screwed: as, a screwable bracket.
Word Usage
"They screwed up plane reservations, guests 'transportation, fees to actors (who of course elected not to come), room reservations, program books, program scheduling ... in brief, if it was screwable, they screwed it up."