I better get this out of the way.
Here is a list of the interjections with their canonized spellings. There are no rules on how/when/why you use them, but I have supplied their traditional “connotations,” which I personally never observe, just because it feels good not to observe them.
Schwunk (pronounced “Shwunk”) … often accompanies some vertical motion, either upwards or downwards.
Schwank (pronounced “Shwank”) … often accompanies some horizontal motion, either portwards or starboardwards.
Krshwunk (notice how the “c” drops out from the “Schw” when the “Kr-” Prefix is added) … often accompanies some forward motion.
Krshwank (same “Kr-” prefix rules as above) … often accompanies some backwards motion.
KaShwank or KaShwunk (notice the “Ka-” prefix forces the capitalization of the next letter) … often accompanies some diagonal-ish motion.
KaChunk (certain words like these cannot stand alone without the “Ka-” prefix) … usually accompanies some cumbersome impact, even if it’s not a cumbersome impact.
KaTung (the “g” should ideally be drawn out for a few seconds) … usually accompanies some metallic, vibratory event that should be metallic/vibratory but fails to be … hence, you provide the illusion that it is.
KaPashwank (sometimes pronounced “Cup of Schwank” if you’re a retard) … usually accompanies a sitting down movement.
Hubala-Schwunk (prefix is pronounced “Who-Bah-Lah”) … usually accompanies a standing up movement.
Hubada-Schwunk (prefix is pronounced “Who-Bah-Dah”) or Hubada-Shwank (notice how hyphenated prefixes cause the “c” to be dropped in “Schwank” but not in “Schwunk”) … usually accompanies a transition from not moving to moving.
Nrsht (notice the complete lack of vowels) … usually accompanies pain, either real or imagined.
Shnarf (alternative to “Snarf” which is what the character Snarf constantly says in the cartoon Thundercats) … usually accompanies feelings of inferiority and “Please don’t hurt me”-type moments.
I probably missed some. This is subject to updates.