Superlative form of stretchy: most stretchy.(adjective)
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Use "stretchiest" in a sentence
"Although only by the stretchiest stretch can my lenses be considered mechanical, you can still say that some of my organs have been replaced with technology."
"Guinness says this woman in Chicago has the poppiest eyeballs, this man in L.A. the stretchiest skin."
"This man in L.A., the stretchiest skin, but this man in the White House may soon hold the title for most disliked president."