In endurance sports, particularly cycling and running, hitting the wall or the bonk describes a condition caused by the depletion of glycogen stores in the liver and muscles, which manifests itself by precipitous fatigue and loss of energy. Milder instances can be remedied by brief rest and the ingestion of food or drinks containing carbohydrates. The condition can usually be avoided by ensuring that glycogen levels are high when the exercise begins, maintaining glycogen levels during exercise by eating or drinking carbohydrate-rich substances, or by reducing exercise intensity.
I bonked at 80 miles, just nothing left in the legs.

I completed the marathon without bonking.
di BodyAttacker 25 aprile 2011
Having sex. It's a word that is widely acceptable in British society - not as rude as shag and *far* less rude than the offensive fuck.
The London Times recently wrote that President Bill Clinton "may forever be known as Bonking Bill."
di martin 12 novembre 2003
Having Sex
He was bonking his lover
di weird jazz 13 agosto 2003
Communicating via various online chat platforms while sober yet implementing an inebriated persona due to an overall lackadaisical disposition.
He was IMing me all night, bonking as he always does.
di Alley Cats 26 ottobre 2011
a sport where you roll up large paper and hit people hardly on the head
dudee shes bonking people in the halls!
di Lala lindsey 30 gennaio 2009
having sex using a space hopper
man sits on space hopper woman mounts herself on his throbin robin and off we go bouncy bouncy
di totalguy 08 gennaio 2004
Moii and Jade decided that bonking means WANKING. We thaught of this word cuz of how the printer woman would say Bonnie. xD
When bob is alone, he bonks over gay porn.
Shut up, im bonking.
I bonked yoor mum.
di mooseface 05 novembre 2006

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