Oh Crap is a transformation in The Binding of Isaac, added in the Afterbirth DLC.
Obtained by acquiring any 3 items with the poop tag.
Causes Isaac to heal half of a red heart each time a poop pile is destroyed.
Has a 6.66% chance to activate The Poop every time the timer hits 00.
This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this transformation for the previous Repentance version, check this page instead.