This made me laugh cause "cuck" to me has always been in reference to a weak man that let's his gf or wife do as she pleases, i.e. cheating, wasting his money, etc.
So knowing there are no female Namekians, I am now wondering if men can be cucks for other men.
I know what you meant though, just "weak of him" to do it. He watched Vegeta destroy his village. He was justified to consider this option IMO. lol