1 definition by ivcabel
when youre banging a fat chick and your nuts slap your grundle then her taint so furiously that it makes a boom boom clap sound.the reason the sound is boom boom clap is because one boom for you one fer her and then the clap is the sound of her thighs smacking together.
neil was banging this fat chick so hard that all that his buddies next door heard was grundle thunder. Neil then walked out with bloody ears when he exeperienced sonic boom.
by ivcabel August 7, 2006