1 definition by MonsterousMonster

A fallon is a unit of measurement used to describe how sexually attractive a man is. One fallon is equal to Jimmy Fallon. This unit is typically used by homosexual men.

The fallon system has very few rules. To be a valid measurement, it must be a positive number between zero and 10. Fractions and decimals are permitted (a person can be half a fallon) but nobody can be zero fallons. Generally, a 10 is not given as it implies the perfect man, but is valid.

The fallon number system is metric, so prefixes may be added to the unit.
Hag: "What do you think of my new boyfriend?"
Fag: "He's about 3 fallons, maybe 4 after a few drinks."
by MonsterousMonster January 18, 2010
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