Top Definition
You understand something perfectly

You perfectly understand how a mechanical device works

You perfectly understand a task you've been given and know how to complete it
Luke: so you think you can fix my car engine?

Danni: yeah mate no problem.

Luke: how do you know what to do?

Danni: well iv done it before so iv practically got system in my eyes
by Danni101 December 08, 2011
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