Mine was spelled phuk or phuc , really

Yes, they do put it in pretty much all dishes, and it's always offered on the table as a condiment along with chili, sugar and vinegar.

Mon said that typically oyster sauce is used in fried dishes such as khao phad (fried rice) and phad phak (fried veggies). Basically if it's fried there's a fair chance there's oyster sauce involved, especially if the dish involves fried rice.

Most Thai food involves balancing soy sauce, fish sauce, sugar, oyster sauce and vinegar somewhere down the lines be it during the cooking process or at the table.

Thanks for clearing it up
Pity i can't eat Thai dishes

Thanks for clearing it up
Pity i can't eat Thai dishes

No worries.

You could still eat Thai. Just ask them not to use fish sauce or oyster sauce. I'm sure salt or soy sauce could be used in their stead.