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A friendly gesture between two heterosexual men, where one inserts a finger into the other's anus as a means of greeting.
1) Vincenzo Capozzoli always leaves a gentleman's calling-card.

2) I expressed our fraternity through the means of a gentleman's calling-card.

3) Gads, that young whipper-snapper just left me a gentleman's calling card, what a cad, what a bounder!
by Baarakiss August 11, 2008
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