Amber Rose & Blac Chyna Shake Their Great BIG Tails ... And Feathers at Carnival

0209_mardi_gras_blac_Chyna_amber_rose_launch2The entire island of Trinidad is waking up with an ass hangover -- courtesy of Amber Rose and Blac Chyna's awesome Carnival appearance.

The BFFs were front and center for parades all day and night, and fans captured the action from ALL angles. But one was more popular than others ... obviously.

Ass Wednesday, indeed.