A variation on a Blast Off, a 'Suck Off' is a way to end a sketch quickly whereupon one character performs fellatio on another character. This notably occurred in Episode 86 when Dr. Dianne Strize sucked off Ben and Greg after pitching the 'Psychology Sack' to them in the Grub Tank special. Somewhat unusually the ending is used in a tightly scripted sketch The Dad Milk Sketch in Episode 87.
A suck off is also used to end the School Assembly Episode (Episode 99.6) between Mary Seymour and Principal Michaels.