1. a genetic hybrid of both the marmota monax and homo sapiens taxonomic classifications;
2. a man or woman whose facial features (i.e. hair, eye placement, small rounded ears, buck teeth, etc.) resemble distinct characteristics of a woodchuck or groundhog;
3. sean gavigan;
that dude was such a manchuck.
Person A: Who does that guy remind me of?
Person B: A manchuck.
Person A: Ha! For sure.