The sound of Sprite hitting the back of your throat.
Aww man my throat is so dry... hey gimme that Sprite -- shpladow!
Originating from aforementioned Sprite commercial. However, in day-to-day use is actually a term for a cumshot splashing the back of the intended recipient's throat forcefully, in same thirstquenching manner as Sprite.
Chris exclaimed to Joe, "Last night I awoke to yer wife giving me favors under the covers. Yeah, you know she got that *SHPLADOW*! Then I promptly kicked her out the window & went back to sleep."
The sound one encounters when presented with the male genitalia.
Yo, Jenna baby....SHPLADOW!