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Euphemism for masturbating.

Origin - somebody from our office building appears to masturbate in the 4th stall in our shared bathroom every afternoon.
"I don't feel much like going out tonight. I'm going to 4th stall it at home."

"It's been a slow day at work - I 4th stalled all afternoon."
by EyeballIB July 16, 2013
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