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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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2
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
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