Following the link for “wankpuffin” (beautiful word, btw), apparently the one-syllable followed by two-syllable construction is a distinct pattern, called a “shitgibbon” (https://en.wiktionary.org/wiki/shitgibbon)
Noun
shitgibbon (plural shitgibbons)
2. (linguistics) A type of antibacchic compound word used as an insult, consisting of a single-syllable expletive, followed by an absurd or innocuous two-syllable noun as a trochee.
Also,
> a special tank you enter to jerk off.
feels rather insulting to me. It’s not exactly something I would want to be associated with.