Def 1: some one that cannot assert themselves when necessary

Def 2: a problem an infant has when he/she cannot learn to breastfeed/suckle
Ex 1: "Mark said that guy was a weak suck because he was letting his ex-girlfriend walk all over him."

Ex 2: "The newborn could not get the nutrients needed due to the fact she had a weak suck."
by deekayCA February 4, 2010
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Someone or something that is weak in their efforts and suck at doing it.
That soccer player is a weak suck. He doesn't try and he looks bad doing it.
by Betty Bramlitt August 2, 2007
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