Top Definition
a distastful person who's rude for no reason; bitchy; makes rude comments; immature people are described as such

(i.e a rude teacher, a friend, a frenemy, or anyone)
Student: Dude what's up with Mrs. H?

Friend: idk man, she's fatty acid right now

Student: i know right? she needs to get some..soon
by justch3ck1n February 04, 2010
1 Word related to Fatty Acid

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