What you disgustedly snort to someone who is selfishly trying to take up more than his share of available space, such as in a bed, on a couch, in a passenger's seat, etc.
When Chief Tecumseh was negotiating with General Harrison, he crowded Harrison toward the end of the bench they were sitting on. When Harrison made a "Oh, no, you don't --- nunna the ol' 'camel and Arab' routine!" type of protest, Tecumseh smiled knowingly and replied that he was trying to illustrate to General Harrison how his people felt about being pushed off their tribal lands by the English settlers.
'Camel nose' refers to the outline of a human male's penis and scrotum, as seen through tightly fitting clothes. Camel nose commonly occurs as a result of wearing tight fitting clothes, such as jeans, shorts, sweat pants etc...Due to a combination of anatomical factors and the snugness of the fabric, the crotch bulge may take on a resemblance to the nose of a camel.
If I pull my pants up any higher everyone is going to see my camelnose!