Best definition
wank-pit
bed in which one masturbates. (see wank trough)

Jesus Christ was born in some fucking farmer’s wank pit.
wank-pit: define #2
wank pit
Typical teenage boy’s bedroom
Dad – “Fraser get out of that stinking wank pit, it’s 2 o’clock in the afternoon”

Fraser – “Urrrgh, later, leave me alone”
wank-pit: define #3
wank pit
A male teenagers bedroom
Dad – “It’s 2pm get out of that stinking wank pit”

Son – “Later – OK?”