1. most full of gas or producing the most gas
Usage: superlative form of gassy
2. most talkative or boastful
Usage: informal

Examples

• That was the gassiest soda I’ve ever had.
• The beans made him feel the gassiest he’d been all week.
• She’s the gassiest person at every party, always talking about herself.
• His gassiest speech lasted three hours.
• The carbonated water was the gassiest of all the drinks.
• He became the gassiest after eating too much dairy.