When a man stretches out his scrotum sack and bounces his penis off it like a monkey jumping on a trampoline. This technique was created by two brothers from Mass.
Jack loves playing with his sack, his favorite manuver is the monkey on a trapoline.
A tramolineanjelkasouroustinariam is either what you can call a friend, meaning "friendly creature", or as an insult to someone you find weird. For using it as someone you find weird, it has to have an N instead of an M at the end, meaning 'weird creature".
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi