look up any word, like blumpkin:
 
1.
a sexual enconter where u take a hit of a bong and blow it into the vagina
dude she let me billy bong her twice last night!!!!!!!
by william simpson January 10, 2009
 
2.
to take a hit of a bong or pipe or joint or blunt and blow the smoke into A WOMEN'S VAGINA then make her blow it out (if she can)
dude i got my gurl to let me billy bong her twice and once this morning!!!!!
by Billiam simpson January 10, 2009