When watching others have sex in a car, you wank off and spunk on the wind screen then run away.
I was walking through a car park and saw a couple getting it on, I had no choice really. A bit of seagulling was in order so I knocked one out and seagulled them!!!
by KamMan April 16, 2013
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Seagulling is a variation on the sexual practice of bukkake, with the crucial difference that in this case the recipients are unwilling.

One person learns about two people that are going to have sex and works out the location of the aforementioned event. Then he gathers as many guys as possible and packs them into the room where it's going to take place. The guys hide in cupboards, behind curtains - basically, wherever there is a place to hide. Then when the couple look like they're about to finish, everyone runs out and ejaculates all over them and then proceeds to run around them, flapping their arms like birds and making seagull noises.
Mike's friends thought seagulling on him and Susan would be great fun, so they all hid until the time was right.
by mynameislucy June 28, 2005
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When there are lines of drugs available, it's not your turn, but everyone is talking too much shit to realise it's there.

It is 100% acceptable to swoop in and and do their line, as long as you make the noise "CAAAAAAAAWWW!" beforehand.
"Mate ,did he just do my line?!"

"Yeah, he went seagulling. Tough shit"
by Dangle Dude July 1, 2017
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A ritual which is popular in all-male prisons, whereby said inmate ejaculates into his palm and throws it at the next unsuspecting prison guard who walks past his cell.
"Yo dude, you gotta keep seagulling that screw!
by Mel "Homey" Howells September 12, 2006
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Past Tense Verb. A Seagulling, or being Seagulled occurs when the ejaculate from a male falls out of the male's partner and onto the male when the partner removes themself from atop the male after sex.
"My wife rode me this morning, but when she got up I got Seagulled."
by PhillyDave January 22, 2014
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when you ejaculate into your hand then go up to someone you know or an authority figure and throw it in their face.
Russell Brand talks about what the act of seagulling is,
http://www.youtube.com/watch?v=jvCelcXkpx4
by brotherinspirit September 8, 2008
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The act of surrounding a car, where two or more persons are having sex in, and masturbating onto the car windows, thus giving the effect of bird poo on the windows
I had a great night dogging the other night, me and the boys really seagulled a Focus, whilst watching some nasty bird fuck her boss on the back seat
by pisshead0 August 18, 2010
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