i believe that in 180BC the cavemen were playing with stone cards for very high stakes at the time,the buy in was 2 sheep. this was played everyday and a man called kakasa was the most winningest player at the time his net profit was 18 goat and 12 sheep which at that time is the equivilant of 20million dollars.SO anyway the game was running for about 4 to 5 hours} and he had lost his 2sheep then another 2sheep so he was starting to tilt.the he bought back into the game for 3sheep. he got ace king of hearts and pushed a leg into the pot then the person he was playing with pushed 4 sheep{whole}into the pot.he insta called and they flipped over their stones. his opponent was holding the 72o and won the pot with a pair of 2s which he caught on the river. kakasa got so angry he went into his cave and brought back a donkey and said that the donky played better than his opponent thus making the term "donkey" a term assocciated with bad play { so i believe}