After spending enough time on /a/ I've come to understand that NTR is "cuck shit".
At least that's what a lot of people respond when some one post fat_ntr_meme.jpg:
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Long and behold the word literally translates to it
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But this seems different from OP and his associates, the Japs would rather have boogie1488 cucking them?
How does that work?
"yo! Did your gal left you for some other dude?"
"yeah but he's the jabba the hutt looking fella that works at tacobell so she clearly downgraded"
Since this is Japan and Anime I would not be surprised if Tentacled and being cucked by Squidward is a huge thing as well.
Edit: