"Im in ur (noun), (verb) ur (noun)" actually started back in the days of Command and Conquer. When playing against other human players, occasionly one player may say to the other "Im in ur base, killing ur doodz" as in meaning "I'm in you're base, killing your units, and you don't know!" It wasn't untill CounterStrike did the 'craze' actually be known.
Im in ur base, killing ur doodz
Im in ur fridge, eating ur foodz
Im in ur p0rn collection, fapping 2 noodz..