mish is short for missionary, the classic male on top of female form of copulation.  

you definitely need to visit the acronyms and newbies manual linked at the top of the board.

We should give him a break.  I've been with providers who spoke English but were from other countries and didn't know what missionary, greek or asian where. One cracked up with I explained missionary.  She said "like old people do it?"

So I stopped the car, turned to her and prepared to give her a big kiss when she wholloped me one.

"What's the deal?  I thought you said I was passionate?"

She said, "I wanted you to stop the car because my house is back there and you were passing it!"

ba-doom