Esentially a woman that is out of options and instead of fuckboys is looking for nerds to sustain her (and often her child) financially and emocionally. Usually such woman is over or close to her 30's because in her 20's she used to party do drugs and dissolve her brain in alcohol. One day she realises she achieved nothing and either has no children or the father went out to buy some milk, so she decides to find a clueless nerd and claim that she's interested in "nerdy" stuff like watching Harry Potter or Avengers in order to trap him in a relationship with her.
P1: Look at her Tinder profile, says she's a 29-yo nerd because she plays Sims, watches movies like Avengers and her favouite movies are recent Star Wars movies.
P2: Cut it man, only thing you have and she is really interested in is your wallet, she's an absolute nerd snare.