Inhaling a solvent or aerosol spray for the purposes of getting high. Very prevalent with those of the native persuasion, mainly because you can huff gas which they don't have to pay taxes on. It's also believed by some that because gas comes from "mother earth" it is far more spiritual an experience then simply drinking white mans alcohol
Attendant: How come your filling that shopping bag with gas, did you forget your jerry can?
Joe Bearbreath: No, I'm going to huff it and get high then probably fall down a valley, o well the white mans health care will fix me up. YAY FOR HUFFING!