look up any word, like blumpkin:
 
1.
The female version of a taint,the taint is the little piece of skin between your ball sac and anus.
Man, Did u see the grendal on that chick? Look under the vag. n u will see a little bitty piece of skin the kinda looks like a taint.It's purdy
by hyph April 12, 2008
 
2.
to hop up on ur partner during sexual intercourse and ride them, moving slowly, grinding
my girlfriend then grendaled me, hopping on top of my dick and grinding it
by quealana October 07, 2007