Revealing mistake: When Neil starts to sneeze, he carefully puts his hands close to his nose to give the impression that the green jet is coming from his nose. However, in one shot, just before the guys bag him we see the jet appearing from his hand while his hand is several centimetres from his nose.
Other mistake: Just as Brian Damage says, "Oh, weren't ya?" to Neil, you can see the shadow of Neil's mother on the front door, awaiting her cue to come in.
Chosen answer: It wasn't referring to anything real, just that the government's bureaucratic naming, The Guardian's mangled spelling or Rick's bad pronounciation resulted in the unlikely word "Footumch" being spoken.
Sierra1 ★