Talk:Yasuo/Background/@comment-5159141-20131201031248

Both his joke and taunt are references to common samurai practices coming from around the edo period. They'd spray their blades with sake for cleaner, stinging cuts. Juggling the gourd with one's sheath/blade also wasn't unheard of, an "indicator" of dexterity and skillfullness among fellow warriors, although more of a bragging-rights stunt than a technique actually useful in battle.

However, given that these specific two were chosen for Yasuo, I'd say this is based on Haoh-Maru's winposes/taunts from Samurai Spirits/Samurai Shodown series.