Bass Drop
One of the best charictaristics in Dubstep, Drum and Bass etc.

its normaly when the percussion pauses for a second and then comes back with a heavier bassline.

it is always very pleasurable to hear one but you really need to hear it on a big sound system to know how good it is.
"that gig last night was well good"

"yeah...and when the bass dropped"

"yeah it was so heavy"