To argue with someone knowing that you are indeed wrong, and/or have already been proven wrong.
Also one person might be so convinced that they are correct about an argument, while everybody else knows they are wrong.
Additional forms: Snaggeler, Snaggelee, Snaggeling, Snaggeled.
Haggling would be to obtain a lower price, whereas snaggling would be just for the sake of arguing.
Christopher snaggeled that he can eat Mcdonald's and drink regular sodas despite the fact that doctors told him he has diabetes.