geigernaut 

An unstoppable juggernaut.

The geigernaut mowed down the tank single handedly.

geigernaut by Teocarlo Pulgar September 3, 2003

gingernaut 

1.) A person who is almost exclusively attracted to people with red hair. 2.) Someone who has been romantically involved with multiple, ginger haired, partners. 3.) A person that has sex with someone who has natural red hair.

Bobby graduated to official Gingernaut status because he hooked with the redhead girl at school.

gingernaut by Marmutt June 7, 2016