1. superlative form of poopy; most in a state of being soiled or covered with feces
Usage: informal; childish or colloquial
2. superlative form of poopy; most unpleasant, disappointing, or of poor quality
Usage: informal; slang

Examples

• That was the poopiest day I've had all week.
• The baby's diaper was the poopiest mess I've ever seen.
• This is the poopiest excuse you could have come up with.
• The poopiest part of the trip was the broken air conditioning.
• He had the poopiest attitude about helping out.