When two people people, most like stoners, come to a general understanding that they will smoke and then bone each other. can be a term used with friends with benefits or simply with your girlfriend or boyfriend.
"Stonebone tonight?"
"Hell ya, you bring the blunt, and I got the condom".
either an actual monkey made from stone, or a person who, while to stoned for speech, resorts to grunts to communicate.
Stoner: Dude, I've got the munchies. Want to go to T-Bell?
Stonemonkey: Grunt.
Stoner: So... ya wanna go?
Stonemonkey: Grunt.
Stoner: You can't move can you?
Stonemonkey: Grunt