Adj.; Describes one who has quick and jagged actions, especially sexually. This includes fast and painful sex, lizard-like tongue thrusting, and finger-banging. A sharp person can usually be heard saying 'uh uh uh (very rapidly)'. Opposite of "melty".
The mascot of the sharp people would be a rat.
That guy was so fucking sharp. He stabbed my hoo with his fingers so hard, and he actually thought it felt good for me.