A term coined by Canadian divorced streamer Félix 'xQc' Lengyel.
To be a cruster is to only care about superficial things in life, one that has no foundation to build their opinion on.
The type of person to lack a 'core', an inner value.
Octavius: Haha wow this video is so bad, it only has 40.000 views
Chadley: You are such a cruster, get professional help.