A pettalica is someone in generally a friendship group whos only job and use is to travel around and get everyone to places they need to be without them doing anything.
You need to get to work? Just get John to do it, he's our pettalica.
A loving and caring, desirable person, who can befriend anybody and takes no shit from nobody, will party and dance till the sun comes up, will put you in your place and give you shit, but will love you uncontrollably if you give them hot Cheeto puffs
cant wait for petralia to get here we're gunna party all night, but don't piss her off