tremor punch

an extremely dangerous, potentially fatal punch to the torso area (especially the kidney region) where one twists his fist violently on impact thus causing great discomfort and suffering on the receiving end
"men" such as woo are particularly susceptible to tremor punches and could die on impact... so use caution
this term was originated by Drew M (known by some as John Belushi) and was first tested on the biggest oaf on the planet, woo