yucky alien Yby geh1 Best definition yucky alien the act of mooning and spread your ass cheeks while having a turd peaking out of your ass. Dillan gave me the dreaded yucky alien last night. it was awful You may also like: wompems Zoowoot wasting my daytime minutes Wayne Faggot weirdopo Yungsters windowbrowsing whatitdowontknowskullgangyoungmoneydipsetbryrdgangprrrr zex sea Wealth-esteem whootah wear 'n' tear woyft wonk'd writer's center monster Wet my D you know sergio? white hispanic William Gazelle Who ate all the pies?! Who ate all the pies?! You fat bastard! You fat bastard! You ate all the pies!!!