cheerleader

girl, either single or not, who knows you have a girlfriend/fiancee/wife; who sees you by yourself; and who keeps you intrigued in your love interest. the cheerleader may or may not want to sleep with you.

I was traveling alone at the airport, and the cheerleader kept me turned on enough to go back to my girlfriend.

dog

something someone says to imply "I know I'm not supposed to behave that way."

the disorderly youth who said 'what's up dog' on appearing added irony to his behavior