Top Definition
The unreasonable state of mind, typically suffered by females, once a particular age is reached causing overly emotional, unstable and erratic behaviour predominantly concerning the immediate needs of spawning parasitical offspring.
As sure as Summer, the feared bio-illogical clock transformed this fine woman, of such beauty to make the Angels weep, into a terrifying beast of breeding.
by Onyx Lioness June 24, 2010
the internal physiological mechanism responsible for causing one to wake up at workday times on the weekend.

also responsible for any low-grade sleep disorders and the inability to stay awake during any meetings held after lunch.
"it's saturday, go back to sleep!"
"i can't, it's my bio-illogical clock on the fritz again."
by geek.neo March 04, 2010
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