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It is an acronym standing for Weak Ass Little Bitch. Can be used to indicate how weak one little bitch's ass is or in the plural to highlight many bitches' asses and their weakness.
Roger: My boss is such a WALB!
Gary: What?
Roger: A Weak Ass Little Bitch!
Gary: Oh, yeah. Isn't that your dad?
Roger: Yeah, but still a WALB!
by PLAISTOW April 18, 2011
"What a little bitch"
Used when a friend (girl) is being a bitch. Especially when the girl does something that is very bitchy.
Katie got with Ciaran, right after John telling her he loved her. WALB!
by Spud23 December 19, 2010