Used to define a person that sucks and is also a dweeb, but can also be used to describe virtually anything as long as that thing is stupid and insignificant. The word is most commonly used when the person saying it is completely stoned and is just trying to annoy the shit out of someone.
Hey suckdweeb, can you grab that suckdweeb over there for me?
Why do you keep saying suckdweeb? I have no idea what it means.
Sorry. What I meant to suckdweeb was 'Hey chode, can you grab that dildo over there for me?'