Originating from East Oakland in the 90s. Meaning you are chilling very steadily; most likely at your house - or anywhere where you are solo. Posted up like a lamp.
Austin: Hey cuddy, what are you up to?
Cam: Nothin at all - just lampostin gat the spot .
When someone acts extremely lame. Where someone is really lame and it's sillier than a regular dinosaur on their silliest behaviour, resembling a "T-Rex".