to have sex with someone who's married to someone else. refers to the NFL rule of tampering, when a team negotiates contract talks with a player already on another teams roster.
Synonyms for tampering
On this page, you will find 30 slang terms related to tampering. Some of the top words include: piece it up, Garfunkle, fuck in law, lay the pipe, drop it off in them drawers, and 25 more.