A Greek name meaning a 'gift from God', a Mattas is the ultimate score in the bedroom.
"That Mattas was a gift from God!"
"Get a load of THAT Mattas!"
Can also be used as a synonym for erotic:
e.g. 'Wow, last night was sooo Mattas!'
'I like a man when he's Mattas.'
Can also be used as an exclamative:
e.g. 'oh, Mattas!'