When a tranny and a tranny get into bed together and mash the improper parts together to create a 'happy train' The name comes due to the train aspect of people being pleasured with one tranny being pleasured (likely from behind) by another tranny.
Marcy walked into a room so see her sex changed son on a happy train with her transgendered boyfriend.
The awesome yet near unattainable task in which at least 3 girls line up naked from the waist down, you then insert your penis in then out and move onto the next one and when you get to the end you just work your way back. This is usually a game a parties and is a competition in which the person with the most "chugs"(inserts and exits) wins.
Guy one- "Holy shit that party last night was epic"
Guy two-"Yeah i know, btw did u hear that Gary broke the Brazilian train record last night, he got 35 chugs"