Speaks for itself, really. The act of raping, violating, or otherwise molesting someone's elbow.
This is usually characterised by frequent rubbing or squeezing of the elbow against the will of the person attached to said elbow.
A) EMMA ELBOW RAPED ME!
B) Aww... Emma! How many times do I have to tell you.... no elbow rape!!!
walking up to someone and rubbing ur elbow on them while screaming "elbow rape"
i elbow raped that guy from my second period
b/e i can, and he liked it