1. Popularized by rappers (namely 50 cent), this term refers to armor piercing rounds that have hardened steel slugs with a teflon coat. The teflon coat is strictly to protect the integrity of
the barrel, and since it usually peels off during it's trajectory through the air, the teflon does not aid at all in bullet
penetration.
2. This term also refers to DuPont tactical teflon vests. Contrary to
popular belief TEFLON IS NOT BULLETPROOF. Teflon is the nylon-type fabric used for the outside of the vest, while kevlar is the bulletproof material inside. So when 50 cent says he's got "teflon on (his) chest" it may be a bulletproof vest, but the teflon is NOT the bulletproof material.
1. I had my strap loaded up with some teflon so I could drop that fool wearin his vest. Bullets went straight through that kevlar.
2.
Just in case it gets crazy
out there I'm gunna wear my teflon vest. It's got the kevlar for
protection, plus tons of pockets for whatever I might need.