A chemical used a as a pesticide.
Can't beat the Deet
Deet is gudd stuff.
Ugly, nasty, smelly, disgusting
That girl is deets.
That smell is deets.
1) Details, used as shorthand, often on the internet, and often used in the command form.
2) A "clan" of kids who used to terrorize Seattle. They called themselves Clan Deets because they would always go "Deets", or "Downtown" on Friday afternoons.
Deet is a word you use to describe someone or something that is dorky, nerdy, or something you would shake your head to.
That guy is a deet. He wouldn't see Death Cab, he'll go and see Deet Cab.