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1 definition by EssBen

 
1.
The volume rating of a fart (Bp) governed by three variables;- rectal pressure (r), buttock friction (f) and sprouts consumed (SpC). Buttock friction (f) can be reduced to zero by pulling the ringpiece open wide during emission.
"My word said the vicar, that anal exclamation was right off the brapometer"
by EssBen March 04, 2008
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