pizza runner

Someone who is always bringing to you 'pizza' (something good/sex) while trying not to get caught.

Jeremiah was a pizza runner for her. His girlfriend had no idea what he was doing.

runner number

the number given by a runner (someone who buys drugs for minors) to the teens so that they can call him/her if they need something.

Yo that guy gave me a runner number.
Great now we dont have to steal the vodka from my parents.

Runner's Tumor

This is an extremely well-known phenomenon among the mentally gifted. Those who are more mentally capable than their peers have a larger than average tumor in their skull. This tumor, due to its size and maliciousness is capable of doing more damage to the prodigies' brains than the average person. This occurs when these individuals leave the safety of their bed and are exposed to overly dynamic activities such as running, jumping, or the horrible agony of HIIT. Therefore, experts advise these gifted individuals not to expose themselves to any of these dangers. Highly common symptoms of such a tumor are headaches and/or laziness developing during or after the individual commits the sin of performing any of the above-mentioned endeavors.

Oh for fuck's sake - said Einstein - my Runner's Tumor is trashing my brain again!

Olympic Runner

Steven Hawking

The best Olympic runner was the famous Steven Hawking