A fagaletti is
one who is annoying, frustrating and acts
like a real dickhead....the person described knows they are being a real pain in the
arse.....
Person in the office is going around getting
right in peoples faces being generally annoying, telling jokes that are not particularly
funny and has really bad breath, from the previous night of eating a garlic based
spaghetti....therefore that makes this person a fagaletti.
Or
Your driving along quietly and a person that has been riding up your arse for the last 10 minutes zooms past....as he passes you yell in an opera voice 'Fagaletti!'