Shifty Pete
To sneak off to a quiet place by ones self for a quick jerk of the gherkin.
1) "I've got 5 mins to kill, I might go to the toilet for a shifty pete..."
2) Rejected by his wife again, Jason snuck out to his shed for a shifty pete.
2) Rejected by his wife again, Jason snuck out to his shed for a shifty pete.