A noise made when something weird, random, unexpected or scary happens.
Resulting in the noise 'Glutien' - Eeeeeeeeeeeeee!
And flaring of the nosrtils.
It may also be a symbol made by your hands, creating a 'G'
Jess: 'How do you spell can?'
Jacqui:'You don't know how to spell can?'
Jacqui:'Glutien! *flares nostrils*'