An acronym for "good luck I guess".
Mainly used when people choose to defy your advice on a particular matter.
Customer: Hi, I need help with this.
Specialist: Sure, you need to do XY and Z before you go ahead with it.
Customer: Nah, I think I'll still go ahead without doing XY and Z.
Specialist: Cool. GLIG.
Galigard warrior is a refrence to a guy who heavily wants a footjob from a female and will do anything to find a girl that will allow him to do that and praise her.