Verb. 1. To scam, trick, rip off or otherwise dupe.
Noun. 2. An extremely sketchy or shady individual. 3. A piece of shit.
1a. We should keith that dumb ass over there with that $20 dollar bill hanging out of his pocket.
1b. I got keithed last night when I walked to my car and found it on blocks.
1c. After I bought that shitty magazine subscription from that pushy door-to-door salesman, I felt like I got keithed.
2. If you keep staring at girls with that shady grin when you are trying to hit on them you are going to turn into a keith.
3. I went to the can and dropped a huge keith.