pronounced gil_CHRIST! Comes from the latin word christgilelo meaning garbage collector
That gilchrist be stealin' my lawn mower!
A Gilchrist is a ten second period of time. Can be abbrivated to a "gilly". Commonly used as an exaggeration, since few things take a literal gilchrist to complete.
Dude, I won't be long. Ill be back in a gilchrist.