mr_merritt
I believe you mean to say “Uff da”. Trust me on this son…
He is saying “UF.”
Credit goes to Shera5
http://vignette1.wikia.nocookie.net/mlp/images/f/fc/Scootaloo_blows_test_tube_out_of_her_mouth_S6E4.png/revision/latest?cb=20160410165837 <- Here is the original.