look up any word, like bukkake:
 
1.
The act of submerging one's entire face into a food item during consumption. The act is usually accompanied by an unjustified level of excitement and almost always results in a filthy chin.
Ugh, that guy is chin deep in his burrito - somebody get him a snorkel and some baby wipes.
by Kilokata February 11, 2013
 
2.
To perform oral sex on a woman. To stimulate the womans vagina with your tongue while your CHIN is planted on her gooch.
"Hey man, I went chin deep on this bitch this weekend..."
by Bryan III October 02, 2006