The point at which someone enters a single-issue universe; purpose: to get themselves a shag. Example: I think we should steer clear of her this evening. After what she said on the last press trip to Barcelona, I reckon she's in her shagitude, and shouldn't be dissuaded from her course of action; namely, nailing that nice bloke over there...
SHAGITUDE
Meaning of SHAGITUDE in English
Slang English vocab. Английский сленговый словарь. 2012