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.
by Will Hiver February 04, 2010
1 Word related to Dirty Billy

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