To experience a strong reaction of surprise, shock or disbelief.
I'll be a monkey's uncle
Often preceded by well: expressing complete surprise or disbelief.
screw off
An expression of surprise or disbelief.
words fail someone
Someone is incapable of describing something with words, especially du…
hold onto your hat
One should prepare for a surprise or shock.
take aback
To surprise or shock; to discomfit.
holy fuck
Expression of terror, awe, surprise, shock, etc.