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1.
Getting a Blowjob while taking a shit
This bitch was givin me a Bumkin and i almost blew my o-ring
by K Bizz June 03, 2005
 
2.
Used to describe someone from the country in Australia who lives in the outback. A bumkin wears raggy clothes and a raggy old hat.
Jackson Brownie from townsville is a bumkin.

You fucking bumkin, give back my hay.
by Mr Agnew November 12, 2006