Def

An abbreviation that expresses certainty; sounds like someone a junior high girl would speak--"Like, I'll like def come over, like haha!"

An abbreviation for defense that is often used in gaming or fantasy football.

In gaming, the abbreviation refers to the ability of a player to defend against attacks. It may also represent a defensive statistic for armor items.

In fantasy football, it refers to a team's defense, which is 1 position in a lineup. The defense can score points for your team by holding opponents from scoring, making interceptions, sacks, and fumbles, or scoring TDs off opposing offenses.