Cuckold. It is not a dirty word, but it has some unfortunate meanings. The usual meaning is that a man is a cuckold, or he has been cuckolded, if his wife cheats on him. Used this way, it is only the husband who can be cuckolded. Another meaning since the 1990's is that this can refer to a ''fetishistic'' practice, a non-standard sexual practice, where either one of two married partners gets pleasure and excitement from watching the other partner have sex with someone else.