1 definition by Optimus Primer
A person that holds the key(s). Whether it be access to something to place or essential information.
1. Ashley has the key to my heart. She's my keyster.
2. Hey Jim, those emails you forwarded about my soon to ex girlfriend really did come in handy. Dude, you're a keyster for sure.
3. DJ Blow's a keyster. He always get us into the hottest parties.
2. Hey Jim, those emails you forwarded about my soon to ex girlfriend really did come in handy. Dude, you're a keyster for sure.
3. DJ Blow's a keyster. He always get us into the hottest parties.
by Optimus Primer April 12, 2010