When you are being cock-blocked so hard by a girls friend that she doesn't leave her side the whole entire night.

Guy: Yo, did you get with Emily last night?
Me: No man, she was siamese-twinning with Lily the whole time.
That girl is always siamese twinning with her friend, you never have the chance to make a move.
by berger321 November 18, 2014
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When you are having intercourse with a Siamese twin and one is sucking your dick while the other is eating your ass
I just did the Siamese saddle with These two twins.
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Siamese Eel refers to a rare sex act with a man that has two penises. The 2nd penis can be either natural, as in the popular Reddit post where a man with two functioning penises created an Ask Me Anything, or artificial.

The term was recently popularized in the show Schitt’s Creek where the character, Moira Rose, feared her series of “tasteful nudes” were leaked on the internet. One of the search terms of the photos were Siamese Eel.
Friend 1: I had a Siamese Eel last night
Friend 2: that’s a myth
Friend 1: *shows photo of Siamese Eel*
Friend 2: how did you even get
Friend 1: there’s a video
by MoiraRose January 14, 2021
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A couple who somehow got conjoined in an awkward situation and decided to stay that way because they were deeply in love.
A couple who is madly in love with each other gets stuck together with some sort of substance (i.e. - sticky tack, glue, SUPER glue, etc.), who would be called a Siamese Couple.
by Nicdecdel March 26, 2010
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when both partners engaged in sexual activities orgasm simultaneously
My girlfriend is into all that sentimental sensitive shit, like siamese screams.
by Julie Cali July 16, 2006
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A penis that splits, having two ends.
"He can fuck her in both holes with his siamese penis!"
by FMA_Fan March 22, 2005
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"And every crotch is a siamese gun."
by Roxanne March 7, 2005
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