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"Don't get your hackles up."
i.e. "Don't get your panties in a bunch"
The feathers in the neck of a dominating cock or a so called rooster.
Cock-a-doodle-doo!!!
Woah that rooster must have fucking large and long hackles in its neck:O
Hackles by ChrisO'Neat May 12, 2010
To be really irritated. Also the name of a funny webcomic.
hackles by w00tw00t April 5, 2003

got my hackles up 

to become irritated, angry, or irate about a particular subject. to bristle at a disagreeable suggestion, request, or order.
That imbecile got my hackles up telling me I was wrong about who I voted for. What a frigging libtard.
got my hackles up by no1sandman September 4, 2017
A prestigious k-12 private school founded in 1899 in Tarrytown, NY (Westchester county). The only school in the Ivy Preparatory School League that extends outside of the 5 boroughs of NY--Trinity, Dalton, Collegiate, Poly Prep, Fieldston, Riverdale, & Horace Mann all reside in Manhattan, Brooklyn, and the Bronx respectively--which means for sporting events we get to drag city schools all the way out to Westchester just to woop their asses.

Hackley is known for its rigorous, respectable academics and amazing athletics. Notable teams include: Girls Varsity Soccer, Wrestling, Swimming, Track, and Lacrosse.

Also, Hackley is adored for its gorgeous hilltop campus and classic tudor architecture.

GO HORNETS WOOOOO!!!!
"Hey did you see who won the Ivies swim meet for the 6328239th year in a row?"
"Hackley Hornets!! DUH"

"yo did you hear that horace mann guy scored a 2400 on his sat?"
"uh so did 2/3 of the hackley seniors..."