sock it to the nuts
The act of sliding your penis in a girl's vagina until your testicles touch her pubic region. Completely covering your penis. Much like pulling a sock over one's foot.
Yeah that girl I took home last night let me sock it to the nuts.
Sock-a-nuts
is when your nut sack hangs down to your kneecaps
Man you got Sock-a-nuts it looks like somebody threw two walnuts into a sock.