Filling a balloon with semen and using it to bludgeon a family member or friend.
Mum, Harry is using 'the big one' on me!
by Nut in it November 22, 2021
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A sex act often performed in snooker halls.

The black, the pink and the blue balls are inserted into the anus and the erect penis has a dusting of chalk on the tip.
Jimmy, do you fancy a game? Winner gets a one four heaven.
by NorthernPython January 16, 2017
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When a person falls in love with a girl and thinks she is the only one for him/her.
"Wow, Robert has a horrible case of one girlitus! ""Yea, he needs to remember that girls aren't special but just warm wet holed to dump your sperm in"
by IHaveOneGirlitus April 24, 2018
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Having a cheeky wank without anyone knowing.
Be right back I'm off to sly one off before my wife gets back
by Just the tips November 4, 2018
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Has a secret meaning, ask a friend to find it out
by Erin-Sofia October 10, 2021
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