McAbby refers to the NCIS fandom shipping of two of CBS's shows NCIS main characters,Special Agent Timothy McGee and Forensic scientist Abby Sciuto. Abby is a technogeek goth girl, while McGee is a techno geek with a choir boy image about him. A really random and weird pairing but cute nonetheless.
To be Mcnabbed is to be plagued with injury and unable to finish an entire season. Other symptoms of being McNabbed include choking in the super bowl, trying to blame shitty performance on racist sports writers, and having a stupid afro.
" I can't believe he blew out his knee on the first snap of the season,... he totally got Mcnabbed "
When there is not a lot of time left in a game that your team is losing and your quarterback is running the 2 minute offense with no urgency whatsoever.