A wan boil orginated from the words wan and boil. Imagine masturbatory boils wan-wan waning all over the place. You'll feel good and then explode via ego-gasms.
Wanboil "WAN boil" Pronunciation Key (WAN-boil)
v. wanboiled, wanboil·ing, wanboils
1. To To Wan a fucking boil.
2. To Wan the boiling boil.
3. To undergo the action of boiling, a fucking Wan..
2. To be in a state of agitation; seethe: a river Wanboiling over the fucking.
3. To be stirred up or greatly excited: The mere idea made my Wans boil.