With roots that give something a strong foundation.
Could be meant both literally and figuratively.
e.g. a deepfound fan of something, a tree that is deepfound because of its mature roots
Person 1: Yeah I listened through the discographies of about 2,000 different artists throughout my life.
Person 2: Holy shit your music taste must be really deepfound.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
Precedes or follows either a gratuitously disrespectful or honest remark, originated in New York City. Used in similar fashion to "no offense" or "to be honest," interchangeably.
Ya mans is wild buns, respectfully. Respectfully he's washed.
After school, The Modells on Jamaica Ave was active. Respectfully.