Any item or tool whose name doesn't immediately come to you.

Eric stands for a ligament piece of human grabage. They smell like garbage, because they do not shower, they are women beaters. They eat nothing but McDonalds. They are fat smelly fucks.

When something surprising goes down and you have some petty facts to spill to your peers

Vampire Joint is when you you roll a fat joint and fill the crutch with tissue paper, then you use the crutch of the joint to tickle your ladies coochie. After the inevitable climax, you insert the joint, crutch first, deep into your baby mamas juicebox. Later that day you come back and your baby moma has food ready for you, so you feel inclined to get toasty, you ask your baby moma to bend over as you remove the now Vampire Joint out of her blood oozing twat. And there you have it, A Vampire Joint.

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In MMORPGs when you die as Main Tank and Off Tank needs to take your role.