npub1nxtyqttcs9x9ku6kjjet0e57r65tqn3rx2wu3eh8vetu7h5tjq0q8l6fck (npub1nxt…6fck)
I bet it's a play on GURPS, since they were contemporaneous. Also they use BURPS on the SJG forums to describe a cut down version of GURPS which makes it extra hard to find information about this game.