it actually means she is sucking you deep throat. otherwise she wouldn't actually have your nuts on her chin.

A jack off buddy (from 'cum' /'come', meaning 'semen', and 'companion'); a friend that you get together with for sessions of solo or mutual masturbation
Variant of: cumpanion (from 'companion' & 'cum'); jack off buddy & wank bud & JO buddy
Similar to: fuck buddy

A dick in your mouth.

A dick in your mouth

this means one simple thing:
You have a dick in you mouth.

This is commonly used in a joke by kids in
Middle School/High School.

Means my dick is in your mouth