1. Someone who engages in blatant and unjustified flattery; An ass-kisser.
2. A person who shamelessly tries to get a share of another person's properties or worth (such as food or social status) without actually having the appropriate level of closeness to this person. They have impaired recognition of boundaries which can lead to very uncomfortable situations as few people know how to deal with them without directly telling them to fuck off.
2. "Si tú no sabes de barrio, pistola o de callejón, sálgase del medio, no sea lambón." (If you know nothing about hoods, guns or alleys get out of the way don't be lambón.)
Fulano #1: Manin, quiere una mordia de este chimi?
Fulano #2: Si, loco que se me olvidaron lo cuarto en el caro
Fulano #1: Diablo, tu si ere un lambon. Siempre con cuarto pero nunca quiere solta