The Gasquiggasplorch was a species mentioned by Zim in the episode "Abducted". It is unknown if the species is sapient and what planet it is native to. Zim told the Almighty Tallest that humans are dumb "like the dull-witted Gasquiggasplorch", indicating that the race is known for being stupid.
This species is one of two alien creatures that Zim has used in a simile, the first having been the "Slorbees" he mentioned in "Walk for Your Lives".