Bleesh is similar to the mafia term forget about it in the sense that it can mean so many different things as far as happy, sad or just plain, ok.
"How do you feel after the pub last night mate? "Aww "bleesh!"(Not bad actualy), (terrible). "What do you think of his new car man?" "Its bleesh" (rubbish)
by DeanTraynor June 05, 2007