Listen to Slob On My Knob online. Slob On My Knob is an English language song and is sung by 3-6 Mafia|Trillville|Juicy J|3-6 Mafia|UGK. Slob On My Knob, from the album The Best of Three 6 Mafia, was released in the year 2011. The duration of the song is 3:00. Download English songs online from JioSaavn.