Top Definition
When having sex with a lady friend you insert you finger into her bum hole and wipe it under her nose (see dirty sanchez) Later on - During the love making - While french kissing your lady friend you wonder - "What is that smell ?"
I gave her a "Dirty Billy" last night and I can still smell it.
ayon kay Will Hiver ika-04 ng Pebrero, 2010
When you cum on the upper lip of your partner, extract pubic hair from yourself and apply it to them.
Since its movember, I'm gonna give my girlfriend a dirty billy today.
ayon kay mjens ika-14 ng Mayo, 2016
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