Derived from the "im14andthisisdeep" phrase "s(he) be(
lie)ve(d)".
The whole phrase is saying "she believed him" and the letters in parentheses
spelling "he lied", but the rest of the letters spell out sbeve sbēve
It's used to mock 14-year-old
girls who think this is actually deep
dumb insta girl: "Oh my god look at this totally deep post"
dumb insta girl: shows him "s(he) be(lie)ve(d)" phrase
a man with common sense: "sbeve"
dumb insta girl: dies