A generic substitution for a curse word/phrase akin to "shoot", "darn it" or "heck".
Used by the character Galaxor , voiced by actor Rainn Wilson in the 2009 DreamWorks movie Monsters vs Aliens.
Galaxor: "It's a shame you won't be around to see what the power of Quantonium can do in the tentacles of someone who knows how to use it."
Ginormica: "I know how to use it. Just...ugh"
(punches the force field which shocks her)
Galaxor: "Don't bother that force field is impenatr..."
(Ginormica punches through the force field and grabs his hovercraft from beneath him)
Galaxor: "WHAT THE FLAGNOG?"