yeappoo Share definition Flag Yeappoo is a word used mainly in texting. It is a combination of yea, yep, and cool. Pronounced: yeahp-oh Person you’re texting: that’s cool You: yeappoo yeappoo by JoeyGProductions January 14, 2018 0 0 Get merch Get the yeappoo mug. Buy Now — $32.95 See more merch