Binding of Isaac: Rebirth Wiki

BBF is a passive item.


  • Spawns a familiar that flies around the room like a Boom Fly Boom Fly and explodes on contact with an enemy, dealing 60 damage to all enemies within its blast radius and 10 damage to the enemy it touched.
  • Added in Repentance Deals 100 damage to all enemies within its blast radius and 10 damage to the enemy it touched.
    • It will respawn 10 seconds after exploding, or upon entering a different room.
  • This item belongs to the Beelzebub set. Collecting three items from this set will transform Isaac into a giant humanoid fly.


  • Most obtained bomb modifiers are applied to BBF as well.
  • The blast can damage Isaac as a normal bomb would.
  • For the first few moments after entering a room, the familiar will do contact damage instead of exploding. This means the familiar will not blow up in Isaac's face if there is an enemy right next to the familiar's starting point. However, it may kill enemies that explode on death.


  • BFFS! BFFS! / Hive Mind Hive Mind: Doubles the contact damage to 20 and increases explosion damage by 25.
    • Added in Repentance Contact damage becomes 20 and explosion damage increases to 125.
  • Mr. Mega Mr. Mega: The explosion damage increases by 50 points.


In-game Footage[]


  • The item's name is a reference to the acronym BBW, which stands for "Big Beautiful Woman".


PC RYLA DX9S (Treasure Room adjacent to spawn)

PC Added in Afterbirth Normal and hard modes only Y4JH C0D4 (Treasure Room adjacent to spawn)

PS4 ROZM NF2J (Treasure Room adjacent to spawn)

Vita W2WV-XNKJ (First floor Treasure Room)

3DS PP2A L6ZT (First floor Treasure Room)

Switch D4RZ HJ89 (Treasure Room adjacent to spawn)


Bug Bug! Added in Afterbirth † BBF sometimes does contact damage to certain enemies without exploding. [Check ingame]
Bug Bug! Added in Repentance BBF can get stuck in corners in The Beast fight.