Where does “ysmygwyr” come from?

ysmygwyr (Welsh) comes from Welsh ysmygu, from Welsh mygu, from Welsh mẁg, from English mug, from English motherfucker, from English fucker, from English -er, from Middle English -er.

Ancestry of “ysmygwyr”, step by step

ysmygwyr traces back through two separate lines of ancestry.

via Welsh ysmygu

StepLanguageWordMeaning
1Welshysmyguto smoke (tobacco)
2Welshmyguto smoke, to produce smoke
3Welshmẁgmug
4EnglishmugEasily fooled, gullible; A large cup for hot...
5EnglishmotherfuckerAn extremely contemptible or mean person; Any...
6EnglishfuckerAn undesirable person; The object of some effort;...
7English-erA person or thing that does an action indicated...
8Middle English-eragentive suffix; agent noun suffix
9Old French-erAlternative form of -ier, verbal suffix;...
10Latin-ārefirst conjugation
11Proto-Italic-āōForms primarily denominative verbs
12Proto-Indo-European-eh₂yétiCreates iterative/ frequentative/ intensive...
13Proto-Indo-European-yétiCreates intransitive, often deponent,...
14Proto-Indo-Europeanyé-

via Welsh ŵyr

StepLanguageWordMeaning
1WelshŵyrSoft mutation of gŵyr; grandson, grandchild
2Middle WelshwyrSoft mutation of gwyr
Every word from Proto-Indo-European yé-Every word from English -erEvery word from Proto-Indo-European -yéti
ysmygwyr — Etymology, Origin & Word History | Etymology Explorer