to devise a sneaky plan in taste to leave somewhere. you feel like ripping your fingers off and frying them. or baking them...just because you're there. and the people around you are total hicks.
to be ditched because you are way too weird and/or high.
"courtney, let's shellhammer this kevin kid. he is wayyyyy too much of a hick."
"oh wow, do you guys realize we were just shellhammered? i guess we're way too weird and high for them. usually we do the shellhammering."