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1.
Describes the liquid products that make up the "wet spot" after doing the horizontal mambo.
Synonym - fuckle
"You don't mind sleeping in the screwage, do you?"
by Big Block May 11, 2004
 
2.
A charge levied at a restaurant or other similar establishment for bringing your own alcohol. More modern version of corkage, as it is more common for wine bottles to have screw tops as opposed to corks.
The screwage here is a rip-off.
by Dave Smartt May 23, 2008