What is Down The Hatch?
1.
Drink up. employs hatch in the sense of "a trap door found on ships."
Come on, down the hatch and forget it.
See
2.
The act of easing your cock into an open and willing mouth, and then easing it in and out.
That damn phloosie wanted a piece, so I slid that peezy don the hatch. She took all 9 inches!