the term denotes any person who holds the occupation of a teacher but does not teach very well, if at all; "teacher" doesn't "teach;" removing the word "teach" from the word "teacher" and all that is left is "er"
Person A: I didn't learn a single thing in my entire semester of medicine because of Ms. M!
Person B: She's a total er, dude.
Person B: She's a total er, dude.
by janduke hichot October 16, 2014
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