Any Apostrophe used inappropriately where a word is plural but not a contraction or a possessive. Much like the opposite of the Harvard Comma, the Community College Apostrophe is used by the uneducated and grammatically ignorant.
"Hey, want to see my photo's from when me and the girl's went hiking in the mountain's?"
"No, and lay off the Community College Apostrophe."
"No, and lay off the Community College Apostrophe."
by @theosus September 30, 2017