Blowing Someone's Mind

When you are performing a sexual activity with a girl and, right before you cum, you put your penis in her ear, therefore allowing you to blow her mind.

"Dude I was getting really hot and heavy with my girl and you'll never guess what she let me do!"
"What'd you do man?"
"Pulled out and blew her mind!"
"Awh damn man that's some crazy shit! Never been able to get to Blowing Someone's Mind before!!!!!"