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1.
A pet-sitter is a girl (or guy) who thinks he/she is a girlfriend/boyfriend to someone who is out of town hooking up with randoms knowing that his/her pet is in good hands.
Marcus went to Hawaii for work, leaving his 13 year old dog with his 'Pet Sitter'. Marcus was able to check in with said "pet-sitter" to ensure his dog's happiness, while still carousing around Hawaii trolling for a good time.
by Irisheyeskb July 07, 2013
 
2.
One who looks after somebody’s pet while they are away for sometime.
It is boring to act as petsitter.
by uttam maharjan December 18, 2011