An act of desparation. In Europe, during the great famines of the middle ages starving individuals would steel the bodies of the recently deceiced. They would hang them upside down over a pot and quelch (form of squeezing) out the half digested reminants of their last meal for their own ingestion.
Im starving, lets go and find a body to quelch.
To do a Chinese firedrill and hump everyone as you pass
We totally were quelching at the stoplight last night.
To laugh so much a little bit of wee comes out.
"I was watching Michael McIntyre last night, I was quelching all the time!"