na-adjective, adverb
Describes the sound or state of rummaging through a cluttered space, or the cluttered state itself. Often used with する to mean 'to rummage'.
引き出しの中をがじゃがじゃ探した。
I rummaged noisily through the drawer.
机の上ががじゃがじゃで、必要な書類が見つからない。
My desk is so cluttered that I can't find the document I need.