Possible Clues:

• MTV toon teen
• 'Fire! Fire!' speaker
• One of a pair of cartoon slackers
• Butt-head's buddy
• TV character often seen in a Metallica T-shirt
• TV character who generally wears a Metallica shirt
• 'Yes, yes, fire, fire, fire' sayer
• Character introduced in the cartoon short "Frog Baseball"
• Cornholio alter ego
• "__ and Butt-head": MTV cartoon