noun.

Definition 1. Derived from head change: the point where a stoner's mind goes from sober to high and feels a euphoric kick in the head; Head exchange is to mean the point where a stoner's mind on one strain of weed is changed to another state of high when smoking a different one.

Definition 2. See fellatio. (But where she sucks on the head of your cock just a few seconds more just before taking the rest of the shaft. bomb.com
Stoner 1: Dude, you go from funny and chill when smoking OG Kush, to hungry and funny and chill when on Blue Bream.

Stoner 2: Must be the head exchange I get when we go from this strain to that one.

Stoner 1: Dude, hehehe, after your girlfriend was staring into the tip of my dick after she saw how big it was, shes also went into a bit of a head exchange, amirite ?

Stoner 1. Dude, you go from funny and chill on that OG Kush, to funny, hungry, and witty when on that Northern Lights.

Stoner 2: Bro, hehehe, your girlfriend went into a head exchange the moment she saw the tip of my dick.
by AntiKorperViral November 26, 2015
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69, Sixty-nine, simultaneously eating pussy and sucking dicks, playing with the cat while eating a dog
Her: Lets fuck
Him: Exchange heads first...
by @Hip_Matter August 28, 2019
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