1.) Someone with an unnatural compulstion to wear spikes and all things metal on all parts of their body. Often associated with maschisocism. Very sexy on girls.
2.) Someone who spikes people's drinks at a party, I.E: Adding drugs/alcohol to them for fun or profit.
3.) Madman (my buddy, not the admin) on a really fucking bad day.
1.) The spiker drifted gracefully into the room, and the preppy girls cringed at the safety pins driven through his arms and thumbs.
A.)Tom is such a spiker. We want him at the party?
B.)Only for the girlfolk.
A.)Holy shit, madman went spiker today.
b.)Oh shit, where do we hide now?