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The act of accidentally touching the moist freezing rim of the toilet with the end of your cock whilst you sit on the shitter contemplating life and snapchatting your nearest and dearest.

It is by the most uncomfortable experience a man can endure.
"Man, I just experienced a chilly trumpet whilst snapping Jessica about what happened in Oceana last night"

"Oh dear how unpleasant!"
by Jonathon Pembersley April 23, 2015
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