The correct expression for "firmly established" or "deeply ingrained."

This is often misheard and misspoken as "deep-seeded" by people who slur their words and pronounce a letter "t" as a "d."
Marcus has a deep-seated hatred for people who use poor grammar.
by WarOnPoorGrammar May 4, 2013
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deep seated: adj. -a severe personal belief felt in the loins, being wholeheartedly convicted of a feeling
It is my deep seated intent to free the beast on my girlfriend later.
by baccngravvy May 12, 2018
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A prank where you pull yourself down on a foam chair, fart, and switch chairs with your friend or enemy. When they sit on the dsi’d chair the smell puffs out. What a surprise!
My chair smells like shit, maybe Seat got a deep seat injection (dsi) by my shitty coworkers.
by Shitty Nick February 21, 2020
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