To fool someone.
It comes from Tom & Jerry cartoon where Tom used to get fooled by Jerry having his head turn into a donkey-like head
To donkey-head someone:

Dude 1-Hey u know I just got a winning lottery ticket!!

Dude 2-How the heck do u know it's a winning ticket?

Dude 1-Those guys sold it to me: they said they don't need money...I got it for just 20k.

Dude 2-U do realize u've been donkey-headed big time, don't you?

Dude 1-"uh-auha-uha" (or whatever a donkey is able to utter)
by AyOxford January 20, 2014
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or a dub but
what a Shrek-donkey-head-donkey person
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