Just the usual donk shortie, wtf he could be fos or actually have a piece?

He obviously insta shoved.

PokerStars No-Limit Hold'em, $1.00 BB (5 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($100)
Hero ($102.05)
Button ($141.70)
SB ($131.10)
BB ($43.75)

Preflop: Hero is MP with A, 7.
1 fold, Hero raises to $4, 2 folds, BB calls $3.

Flop: ($8.50) 5, 2, 7 (2 players)
BB checks, Hero bets $6, BB calls $6.

Turn: ($20.50) 4 (2 players)
BB bets $33.75 (All-In), Hero?