Best definition
A minor injury made out to be a major injury by a needy, lonely or otherwise emotionally insecure person.

Pete: Take a look at my hand doc, its clearly broken in like 5 places…

Doctor: You’ve hyperextended your little finger

Pete: I’m in agony man. Luckily I have a high pain threshold.

Doctor: You and your whinjury are wasting my time

Pete: Jeez, this is worse than the time I had that stroke

Doctor: That was indigestion. Get out.
whinjury: define #2
An fairly insignificant accident that causes you to sob like a baby. See also Ninjury
”I had a whinjury the other day. I got vinegar in a paper cut”