The Howdy Bomb is a term used by douche bags, who are so caught up in the way their hair, tan, eyebrows and abs look, they really want a chick to look more at them than they want to look at the chick. You can always tell a user of the "howdy bomb" by the depth of their tan, the more orange the skin the greater the usage of the howdy bomb. Also, the more puckered the lips the more usage of the "howdy bomb".
Laurence: AAAAAH bra! Check out that chick.
Humphrey: Yo Yo Diggity, Which one?
Laurence: That chick over there with the sweet cuckooglies
Humphrey: Oh Snap! She is banging, lets go over there and drop a sweet "howdy bomb" on her tight ass.
Laurence: Boooooey! You think she'll notice my sweet puckered lips and my nice Oompa skin. I bet she can't take her eyes off my super perfect eyebrows.
Humphrey: "Howdy bomb" here we come.