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1.
HSOWA - Short for the phrase 'Hot Skitty on Wailord Action'. This phrase originated from a topic on the GameFAQS Pokemon Ruby/Sapphire boards when a user noticed that Skitty, a tiny kitten only six inches tall, could mate with Wailord, a HUGE whale, 47 feet tall. Then the user, Endgame, ended up saying 'HOT SKITTY ON WAILORD ACTION!'

And it started from there. It's been shortened to HSOWA ever since.
"Bow down to the HSOWA god Endgame!"
by Icecap August 10, 2004
 
2.
Short for "Hot Skitty on Wailord Action", breeding Skitty (a small kitten) and Wailord (a 47-foot-long whale).
I caught a Skitty! Time for some HSOWA!
by ^_^ July 27, 2003
 
3.
Acronym; A Pokemon term for "Hot Skitty on Wailord Action" Wailord, being the biggest pokemon of all, and Skitty, one of the smallest, are of the same egg group and can breed. Even if Skitty's the male and Wailord's the female, imagine that!
Skitty Fuckin a Wailord HSOWA
by icanthinkofone July 19, 2008