A derogatory term for handful of something taken by a gay person or an overly apparent emotion, can be an insult or a measurement. Usually written in italics.
I said you could only have one pretzel, instead you took a gayful.
You are just a gayful of happiness today.
(Master Chief hands Arbiter a poorly-improvised copy of Call of Duty 4)
Arbiter: (dumbfounded) What in Christ's name is this?
Master Chief: Cock of Doody 4: Modern Gayfuckstupid