When an individual places his/her lips around the tip of one's wiener and blows with all their might producing a farting noise to erupt from their mouth.
GIRL: "Soooo, you want me to do what??"
BOY: "Just like I told you...blow as HARD as you can"
GIRL: "Oh, you mean an H-Blow? Gotcha!"
*WHEN HE/SHE FINISHES, BREAK UP WITH THEM.