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1.
1. A male ginger, usually under age 18, who obsessively drinks milk and naps. As a result, the bones of a portley are almost pure calcium. The blood of a portley is 98.62% milk. In addition, portleys account for 82.7% of the world's milk consumption. They are often oafy and counter the effects of their milk drinking habits to an extent by drinking beer. This is called the "Portley Paradox". Their favorite song is always, without fail, Warm Leatherette by The Normal.
1. That new ginger kid is such a portley, he's always drinking milk and beer.

2. Yeah, I heard him listening to Warm Leatherette this morning.
by Δ Über Hipster Δ February 26, 2012
 
2.
a) Someone who is more round, than fat.
b) Someone who eat's obscene amounts of food, all the time.
a) No John, I don't think you're fat, you're more of a portley fellow.

b) Damn G, you are one portley mo fo! You just ate 56 chicken wing's and a flat of coke!
by Kyle de Jong September 21, 2005