A Sergeant Pepper is when participating in anal sex with a female a man gets her on all fours and as he's about to ejaculate he whips out a pepper shaker places it under her nose causing her to have a sneezing fit thus tightening her muscles repeatedly around his penis.
I Sergeant Peppered that girl last night... she sneezed me into a mindblowing orgasm!
To cast pepper across a person's face immediately before he or she is about to orgasm, in an attempt to make him or her sneeze, and thereby intensify the aforementioned imminent orgasm.
I Sergeant Peppered my boyfriend last night and I'm still covered in multiple bodily fluids.
I tried to Sergeant Pepper her last night, but she just got a load of pepper in her eye.