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1.
verb, to masturbate or pleasure oneself while defecating or 'shitting'.
Also, non-colloquially, to flatten faecal matter with a hammer or other 'bashing' device.
"Ah mate I'm turtle-heading and can't stop thinking about mischa barton - I think i'll go for a Poo Bash"
by Peter Fantastic23 January 21, 2009