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1.
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 04, 2013
 
2.
cool-cool-awesome
that was deep-seated!
by anonymous June 25, 2003
 
3.
Extremely hip or cool. Awesomeness
Naomi Lee is so deep-seated.
by Anonymous June 16, 2003