Ulleh is NOT greek, it's actually in a Lebanese Arabic accent, it is most definently NOT just a random saying. it's actually a slang way of saying "you" equivilent to "man" in english. In the Iraqi Arabic accent it's actually pronounced "willeh" or "willak (short "lak"). It's mildly offensive to elders or people of a respectable status within the community.
Ullah Mullahs are a form of Groveling that one (or more) person makes another person do. it involves the unfortunate person getting on his or her knees and preforming a highly amusing and embarassing form of tribal worship to the other person/s.
A funny alternative to kicking the crap out of someone would be to get them to give you Ullah Mullahs
Jimmy had not payed Jason the money he owed him for over a week, for this Jason and his boys made Jimmy give him Ullah Mullahs on the high street in front of hundreds of people then demanded the money within the week.
Similar to Ugh, but with the addition of the letter "L". "Ulgh" expresses much greater revulsion then the simple use of "Ugh" does. When one pronounces "Ulgh",the sound is comparable to retching.