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3.
Having sex with a daughter and mum in the same night. It does not have to be at the same time. Walking from the daughters room into the mums room is generally where it starts.
I had sex with my girlfriend and her mum asked if I would pleasure her after I was finished. I had a gentlemans lunch :)
by bookert13 June 30, 2011
 
1.
A meal taken in private while evading responsibility and perusing pornography or other sexually explicit material
Bento bow from Sushi King, the lesbian scene from Mulholland Drive: time for Gentleman's Lunch!
by crashcomet December 13, 2010
 
2.
Enjoying a meal or snack, while sitting atop the toilet. Done most often while defecating.
I was pressed for time between work and school, so I had to have a gentleman's lunch.
by Mr. C the Amazing November 21, 2010