1. a popular album by the group Jethro tull
2. a bum, vagrant, or other homeless person
1. Dude, did you pick up Aqua Lung yet? It fucking rocks!
2. Check out Aqua Lung over there...we should give him some change
got this one from my ass bowgartin the ho damn blunt with my massive hit's. thus givin me the nikname aqua-lung
-being able to take such a massive hit you could smoke half a joint in one hit
-Damn aqua-lung save some for us
-yo aqua-lung no more fo yo ass till the next one's rolled up