make oneself appear more intelligent whilst conversing.
'Stop gilesing Matt!'
"I'm not, my glasses really need a good cleaning!"
'By talking, you only prove my point further.'
This originates from a person named Giles who was apparently 'cute as a rabbit', which eventually led to this naughty little innuendo.
"Have you got a Giles with you?"
"My Giles is out of batteries"