Been reviewing the terminology that Nick uses. Below are two terms as they are defined by society at large.
Simp
Definition: a foolish or stupid person, or simpleton.
Slang: an insult for men who are seen as too attentive and submissive to women, especially out of a failed hope of winning some entitled sexual attention or activity from them.
Cuck
Definition: a man whose wife is sexually unfaithful.
Slang: a weak, effeminate, unmanly, or inadequate man, who is often dominated by their female partner.
Nick is a self-described simp for Kayla. His default behavior seems to be to put himself down as he elevates her in conversation, like when Kayla posted a pic of herself for the locals on her birthday. Nick was elated. Clip below with a little bonus at the end around 2:18 (lewd):
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Nick also maintains that he's not a cuck. Nick also seems/pretends to be unaware of any relation between simpery and cuckery.
Nick also uses the term "cucksent" as a confusing way of saying that it is no one else's business what a consenting couple(?) does. The structure of this term is odd since men who are into cucking endorse the behavior (while other cucks are simply unaware of it).
A term like cucksent would fit more naturally as a cuck providing consent. Here's an image to help:
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Nick appears to have used the terms "cuck" and "simp" to the point where they have lost any real meaning. They are just naughty words to use against people he has a low opinion of, akin to "prude" or "incel".