It does exist (in that British people are aware of the US usage and "ill gotten gains") but sounds like a clueless person talking, or a child, so unless deeply exposes to American English nobody would use it themselves. I'm beginning to, but only after 30 years in the colonies.
Hm. Listen some more! We use it in the US Midwest routinely. Had gotten dehydrated. Have gotten bit by that issue. We've gotten the flu around here pretty frequently this winter.
