BHK is an abbreviation for Booty Hole Kiss. A BHK is an act performed by either sex where one partner presses their rectum against the other partners rectum. Then each participant tightens their rectum thus "puckering" and creating the "kiss".
The BHK is similar to the lesbian version of scissor grinding or donut bumping but it is performed with the rectum rather than the vagina.
I was having one-leg-up sex with my girlfriend when I slipped out and we had a BHK.
I saw two lesbians scissor grinding so hard they ended up BHK'ing.
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