An amboosh is a person with unrealistic ideals and views on modern life. These ideals are most often impressed upon them by elder ambooshes. Ideals with regards to sex, alcohol, and the standard joys of life.
Regular teenager 1: Is that chap coming with us to see the girls at the beach?
Regular teenager 2: No, he's an amboosh.
Regular teenager 1: Oh, you mean he's afraid someone might think he's trying to rape the girls?
Regular teenager 3: Yeah, and he's afraid he might get stabbed at the beach.
Regular teenager 4: Not to mention he's worried someone will do anal with his sister if he kisses a girl.
Regular teenager 1: Really? Where'd he get these and other ridiculous idealistic views on modern life?
Regular teenager 2: It's from his born again Christian parents. To be fair though, I'd definitely analise his sister, she's almost a full on amboosh too!