To place a music instrument into you partners mouth while having sex in the doggy style position
Have you ever done the Hillbilly Harmonica?
What's that.
Its when you put a Harmonica in her mouth while you're balls deep, riding her like a pig.
The stratigic placement of a musical instrument in your girls mouth, whilst plowing her from the back.
When she's screaming like a boar, gently place the Harmonica in her mouth to complete the Hillbilly Harmonica.
What did you do last night mate.
" well we had good night until I have her the Hillbilly Harmonica"
Its where you put a Harmonica in your partners mouth while she's being plugged from the back.
She's want pleases but it definitely made a fucking symphony.