People went to Australia and saw these things that liked to bounce. they went to the aboriginees and where likt "wtf are those things?? *points and fuzzy hopping thing with pouch"* and the aboriginees said "kangaroo" so they thought they were called kangaroos but really kangaroo means "I don't understand your question." in aboriginee.
" lyke oh em gee doubleyou tee eff is that thing? " "kangaroo..??" "ah ok! Kangaroo!!!' *thinks* " i didnt ask you a question you dumb fucker..."