look up any word, like the eiffel tower:
 
1.
...a double adapter is one appliance that can have two plugged in....
a woman who takes one guy in each hole (double penetration) as the yanks so quaintly put it....
by mad dog January 16, 2005
 
2.
Someone that bats both ways(bisexual),
can put it in all holes!!!
That lads a double adapter
by kellser May 28, 2004
 
3.
A gay man in the middle of a gay threesome .
He takes it and gives it at the same time.
Timing is everything along with good rhythm.
Rod is just a giver and bob is a real taker but Ben swings both ways so he plays double adapter in the threesome.
by roodboy August 26, 2007