When one drunk dude passes out at high noon with his cock on a girls cheek in the middle of the afternoon allowing for the sun to burn them. Once sobering up, the woman realizes that she has a mushroom burn on her cheek when looking at a reflection in a mirror.
After your partner is done giving you a blow job, she proceeds to turn around and fart/queefe on the head of your penis (the part that looks like a mushroom)
After Bradley was done fingering Bisbee's butthole, Bisbee sucked his cock and farted on it, and bradley said "thank you for the burnt mushroom!"