penises and balls - Viral Trends
I was reading this Reddit post's comments: ' I am the guy with two penises. AMA ' (NSFW), and came upon this discussion (of sorts), where the plural of "penis" has been suggested to be either: "penises", "penii", or "penes". I looked it up and Wiktionary states that " The hyperforeign Latinate penii is occasionally used as the plural in modern English.
Understanding the Context
" Is "penii" or "penes" also correct in ... Plonker used to be slang for condoms, and sometimes for penises. There are several other possibilities, but the context makes this one seem more than plausible because it was heavily used in BBC sit-coms and they were fond of using substitute swearwords that were obscure, which those senses of plonker had become. octopi instead of octopuses scenaria or scenarii instead of scenarios penii instead of penises Although in some cases (see "octopi" vs "octopuses" on Ngrams) the hypercorrected form may be common enough to be accepted as standard usage.
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Key Insights
In the case of "syllabus", for instance, an analysis of the Latin shows "syllabi" to be a hypercorrection.