(well) I'll be a monkey's uncle

(well) I'll be a monkey's uncle

A clichéd expression of surprise or amazement. Well, I'll be a monkey's uncle—Shane actually managed to get his movie made.
See also: uncle

I'll be a monkey's uncle!

Fig. I am amazed! A: I just won $500,000 in the lottery! B: Well, I'll be a monkey's uncle!

I'll be a monkey's uncle

used to express great surprise. informal
See also: uncle