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2.
A reference to the male testicles. Also refered to as uggets.
"Who has the agates? Jeesus has the agates!"
by LT GMan December 25, 2005
 
1.
adverb, equivalent to "like"
I was agate: shall we go to McDonalds? and then Dave was agate: yeah I fancy a big mac
by Goddog87 December 06, 2008
 
3.
A small penis.
This description is more common in the UK.
The guys teased Jack about his teenie weenie, but the girls still like having him around because he made up for the agate in his pants with other skills. What he lacked in natural dickdom he made up for by super-natural lickdom.
by MuseAmused January 21, 2009