"toe" (pronounced like tu) is dutch for "be closed". Alternatively, this may be from "two", as when you blink you close both of your eyes (contrasted with wang/one).
The verb tublink has the addition "unvoluntary". A slang way to say "blink" is mInDu'yIv, literally "chew the eyes", but with the slang meaning of yIv this is "annoy the eyes". (qep'a' 2020)