A sexual act in which the flab of the under arm 'slaps' the scrotum of another person back and forth.
Person one: "Dude, how was that chick last night?
Persona two: "She gave me a slappyjackle in the toilet cubical, it felt amazing..."
Unkempt pubic hair starting from the scrotum and ending at the anus.
Person one: "what was her (gouche train) like?"
Person two: "It was thick as a lion's mane and twice as deadly!"
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