A horizontal growth spurt brought on by the copious consumption of fast food, twinkies or beer, in conjunction with prolific television use.
"Man, this pitcher of beer sure hits the spot after all those chicken wings. better prepare for a girth spurt by loosening the old belt before I settle in for the double header!"
A man with a penis so big that you can mistake it with the following... (football, gatorade bottle, meat loaf, baby's arm)
claudia: "I was fuckin this guy the other day and his dick was so big my baby just walked out... he sounded like Arnold Shewarzenegger and he was screaming IM GIRTH BOY!!" Exs 2. " cleadis: "I fucked this girl so hard the other day that after I got done fucking her I threw a football at her pussy and her pussy caught it like Randy Moss."
Any of a variety of weight related conditions one might suffer from who is density challenged such as hot dog neck, muffin top, cankles and so forth. Similar to a birth defect.
Man, would you look at the size of that guy. He's huge! He's got some serious girth defects.