An exclamation. Use in place of "fuck!" or "shit" or even instead of a grunt or groan.
You are working out and instead of grunting while you lift a heavy weight you shout "Naaaaaaaaaapsterrrrr!" or if you drop a weight on your foot, you may also use this word.
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</4 is used when you really hate someone. This works in the same way as <3 and <4.
Boy: I <4 YOU!!!!
Girl: OMG I <3 YO..
