To degenerate cognitively, to be in the process of having a mental breakdown, the process of going crazy
Jeff: I can't believe what my pops says sometimes. It's like he's incapable of higher thought!
Julian: Yeah, I'd say your pops is going off the deep end LOL!
Julian: Yeah, I'd say your pops is going off the deep end LOL!
by paynasty23 September 12, 2010