To take multiple consecutive bong hits, the duration of which can include an entire evening. This indubitably results in the transition of the participant from sophisticated scholar to paralysed imbecile.
The situation is depicted thus;
Stoner A: "Has Liam been cramming for his test? I haven't seen him in bare time!"
Stoner B: "Nope, he's been chonging again. I swear down, he will be gutted when he gets his results, man!"