God damn it! It is big as fuck! It's so ridiculous, it can't be part of a man!
I feel exactly the same way.
I wouldn't say that working it out term-by-term '不科學'. For me, the slangy expression applies to a claim or a result, and it means that something is obviously factually wrong, or out of the ordinary, such that any sensible men will not be ready to buy or believe it. For example, if a man claims a 12-inch phallus, you will probably say that it '不科學'.1 + 2 + 3 + ... 100 = 5050，如果有个人真的加了 100 次，而且还加对了，你不能说他错，但这种方法是不科学的，
You are so mean!他的方法不是 wrong， 而是 dumb