mustard eater

Term used to describe a person with restrictive eating habits. In an effort to keep calorie consumption at a minimum, restrictive eaters often choose mustard (a low-calorie pungent powder or paste prepared from ground mustard seeds) as their condiment/dip/sauce/meal of choice.

What is her secret for staying so thin? She must be a mustard eater.

Mustard Eater

A hard-ass, a man is above all other men in their manliness. Extreme talent in music or sports.”

“This guitar player is a real mustard eater”
“This guy eats mustard”