AIBU to be really annoyed when i hear the term "fess up"

[NotSuchASmugMarriedNow]

my dd just said it and it made my teeth itch!

YANBU. Although 'makes my teeth itch' is also an unreasonable phrase in my book!

'Fess up' doesn't bother me, 'made my teeth itch' however . . . . .

Yabu.

There's a lot of chat on here about I hate this term, I hate that term....I can't honestly see what it is in these expressions that people find so worthy of scorn!

YANBU

I hate it too!!! It doesn't even make sense! How you get fess up, from confess, I do not know. Where does the "up" come from!!!