A variation of the typical boner, the Full Blowner is a boner which has reached terminal capacity in both girth and length, pulsating and throbbing almost uncontrollably. It is almost always at a 180 degree angle to one's stomach, unless it is naturally crooked. The Full Blowner typically occurs just before ejaculation and has a short life span.
"Dude, that full blowner is worth writing home about!"
noun: a full blown boner. When all of the blood has rushed to your penis from seeing something so attractive. The biggest one's boner can get
Jeff: did you see that new playboy show?
Zach: No doubt... it gave me a Full Blowner