1) A man whose wife is sleeping with other men, he may or may not have knowledge of it but when calling someone a cuckold it usually insinuates that he does.
2) In porn, it usually has to do with a white man with a small penis watching a black man with a big penis fucking a woman (almost never actually his wife, but portrayed as such for the porn flick). Many homosexuals who are too scared to admit they're gay watch it just because it has a big dick; they couldn't care less about the woman.
1) He's a cuckold... his wife is sleeping with everyone on the block.
2) That fat faggot is watching cuckold porn again. He's really making us white people look bad...