From Homestar Runner Wiki
The Deke is the star forward basketball player on the same team as Strong Bad according to Words I Probably Said. The Deke once received a pass from Reg at the top of the key, and slam-dunked it. Strong Bad was disappointed. The Deke shoved Strong Bad to the ground and called him an unknown word, since Strong Bad skipped ahead right before the word. The word was, presumably, a swear. The Deke also (perhaps) provides a review of Strong Bad's rock opera in the email of the same name. The Deke also apparently starred in Axe-Gun: Legends Of The Brain Outener in rated. A "deke" in sports is when a player with the ball spins to get past the defense. It's most often used in hockey, not basketball.