Old school term for a chump who is easy to scam or assault verbally and/or physically; normally used to remind an adversary that they, well, suck. Suckas are known to start some mess they cain't finish and can be seen throwing rocks from their glass houses.
Man, you youbetta clear on out before I turn my dogs out on you, sucka.
Poker player who never pays attention, relies on the dealer to remind him that its his turn to act, pretends to not now everyone is waiting for him to act, and continuously stalls out the game with a dismissive attitude.
A person who was tricked. Someone who is gullible to the world and his surroundings. Usually attached to someone because they fell for something idiotic.
At work there is a ghetto person named Tolerba who we designatethe mayor of SuckaVille because he is the ultimate sucka.