To have sex in your friend's bathroom with a bicycle helmet on.
Man last night when we were drinking i totally pulled a giller
by royburg March 5, 2008
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You disapprove of something someone said, automatically making them a "Giller".
This word usually lets the other person know where you stand with their suggestion / comment / plan.
Usually used after the companion says the offending sentence but in enxtreme cases you may interuppt and say loudly and proudly "Giller"
You may also optionally add either "Thriller" or "Killer" to further add to the situation.
Situation 1

Person A: I think you should lend me a ciggerette.
Person B: No i always lend you them, you never have any
Person A: Come on i always give you them back.
Person B: Oh for god sake your a giller

Situation 2

Person A: I'm going to mess around with your sis....
Person B: YOU GILLER KILLER / YOU GILLER THRILLER
Person A: ...tem
by Cainzor October 3, 2006
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A crazy or ridiculous plan that is almost guarenteed not to be carried out
"Yo this summer we should rent a car, drive no stops to california just to get on the Tom Green show"
"dude thats such a giller plan"
by Colin Forde December 6, 2006
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