Crutches, in my language. We got our collective ears chewed out about it by a hard ass teacher in school. I think I don't use crutches no more, but I could be wrong.
Filler words is the most correct answer because words like "like" do actually have meaning, but there is also something called embololalia (also spelled embolalia), the insertion of meaningless sounds/words into speech, which would include "uh, ah, mmm," etc.