when you are about to ejaculate when you are having anal sex or doing doggy style, you spit on the ladies back making her think that you came, then when she turns around splurge in her face.

The sneak a peek is when you are engaged in anal sex via the Doggy-Style position. Right before you ejaculate, spit on her back. She will then turn around smiling thinking you have blew your load. That is when you let that cum out all over her face.

While doing a femal or male in the doggy style position, you spit on their back and when they turn around to say "WTF!" You cum on their face.

Checking out a girl behind her back.

The act of checking out a girl without her noticing.