Acronym or Onomatopoeia?

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Put in your requests meow 1

Pspspsps 2

Pwease? 3

He'll catch one for us 4

Heartwarming Hoomans Adopt "Fixed" Cat, Only to Realize Their Sterilized Superstar Secretly Stashed Some Stinkin' Cute Stowaways 5

Purrpetually hungry 6