Pronounced with all the letters flowing together, so it would be "obec".
The opponent throws the ball and misses. The O.B.E.C. throws the ball and just barely hits his opponent.
O.B.E.C.: "Ohhhhhh yeah did you see that shot? That was pure skill! You, my friend, are OUT! OUT OUT OUT OUT!"
Opponent mutters to his friend: "He's such an obec."