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3.
The act of anal intercourse after consuming a spicy Mexican dish. The act is considered a "true" or "proper mexican subway" if the recipient of the anal penetration has a loose stool due to the effect of said mexican food.
"Ordinarily I'd love to slip you the Liberace... but we just ate some cheap Mexican food and frankly I don't want my cock marinating in the slurry of beans and enchilada sauce you undoubtedly have boiling away in your lower intestine - I'll take a pass on the mexican subway.

or, "If Father McDaugherty thinks he's gonna give me the caboose comunion as penance for not swallowing on Lent... I'm making a run for the border so I can cook his crank with a lethal mexican subway."
by devilreyes February 21, 2007
 
1.
The act of inserting one's penis into the armpit of their romantic companion and thrusting it in and out. (lube recommended)
Bro 1: "Bro, the other day I gave my girlfriend a Mexican Subway."

Bro 2: "You sick fuck..."
by PLZSTFU September 30, 2011
 
2.
The act of anal intercourse after consuming a spicy Mexican dish. The act is considered a "true" or "proper mexican subway" if the recipient of the anal penetration has a loose stool due to the effect of said mexican food.
"Ordinarily I'd love to slip you the Liberace... but we just ate some cheap Mexican food and frankly I don't want my cock marinating in the slurry of beans and enchilada sauce you undoubtedly have boiling away in your lower intestine - I'll take a pass on the mexican subway.

or, "If Father McDaugherty thinks he's gonna give me the caboose comunion as penance for not swallowing on Lent... I'm making a run for the border so I can cook his crank with a lethal mexican subway."
by devilreyes February 22, 2007