Where does “pierutyyny” come from?

pierutyyny (Finnish) comes from Finnish tyyny, from Swedish dyna, from Old Norse dýna, from Proto-Germanic dūnaz, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

pierutyyny (Finnish): whoopee cushion

Definitions

whoopee cushion

Ancestry of “pierutyyny”, step by step

pierutyyny traces back through two separate lines of ancestry.

via Finnish tyyny

Step	Language	Word	Meaning
1	Finnish	tyyny	pillow, cushion
2	Swedish	dyna	a cushion
3	Old Norse	dýna	—
4	Proto-Germanic	dūnaz	Alternative form of *dūnǭ; down
5	Proto-Indo-European	dʰewh₂-	smoke; mist, haze

via Finnish pieru

Step	Language	Word	Meaning
1	Finnish	pieru	A fart
2	Finnish	-u	Forms nouns from verbs. Most common with "e"- and...
3	Proto-Finnic	-u	Forms nouns from adjectives, nouns

Every word from Proto-Indo-European dʰewh₂- →Every word from Proto-Germanic dūnaz →Every word from Old Norse dýna →