It was slang in the USA back in the 50s and maybe into the 60s. I do not know if it is still used. I did not hear any of my 5 children use it.
Personally, if I were a teacher, I would find this term offensive.
Here is the entry from Webster's New World Dictionary-
TEACH
vt.
taught, teach-ing from ME techen < OE t+can < base of tacn, a sign, symbol (see TOKEN); basic sense “to show, demonstrate,” as in Ger zeigen
1 to show or help (a person) to learn (how) to do something !to teach a child (how) to swim"
2 to give lessons to (a student, pupil, or class); guide the studies of; instruct
3 to give lessons in (a subject) to someone; help someone to develop (a skill or trait) !teaches French, taught him self-discipline"
4 a) to provide (a person) with knowledge, insight, etc. !the accident that taught her to be careful" b) to attempt to cause someone to understand or accept (a precept or philosophy), esp. by one's own example or preaching !her life itself teaches nonviolence"
5 to give instruction at or in (a place) !to teach school"
vi.
to give lessons or instruction; be a teacher, esp. in a school or college
n. teachability or teachableness
adj. teachable
adv.teachably
SYN.—teach is the basic, inclusive word for the imparting of knowledge or skills and usually connotes some individual attention to the learner [he taught her how to skate]; instruct implies systematized teaching, usually in some particular subject [she instructs in chemistry]; educate stresses the development of latent faculties and powers by formal, systematic teaching, esp. in institutions of higher learning [he was educated in European universities]; train implies the development of a particular faculty or skill, or instruction toward a particular occupation, as by methodical discipline, exercise, etc. [he was trained as a mechanic]; school, often equivalent to any of the preceding, sometimes specifically connotes a disciplining to endure something difficult [he had to school himself to obedience]
Notably, one does not see teach used in the slang manner that you inquire about.
Jay
