In the same reference as in :balls deep only meaning your dick is bigger and runs deep so deep put her ass in convulsions n to sleep🤤💯

a long way into something, very involved, mixed up in, stuck in; usually something bad.

usually ends with the words "in shit"

to be in knee deep means to be in a situation to a great extent, generally "knee deep in trouble". It can also be literally knee deep, for instance "knee deep in he dead" from DooM.

Generally deeper that "ankle deep", but always less than "Up to here!"

In trouble.

A certain male or female individual who is very popular with the opposite sex and could have anyone he wanted.