С тех пор как они расстались, он ведет себя неадекватно.
Definitions
The phrase 'off the wick' is an informal or slang expression that generally means something is very fast, intense, or extreme. It can refer to a person acting wildly or a situation that is out of control. The origin comes from motorsports, where 'wick' refers to the throttle or fuel flow, so 'off the wick' means running at maximum power or beyond normal limits.
