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The Act Of Landing a Left/Right Hook straight onto the side of someone's head, when done effectively knocking onto their ass. (Top/Head, Side/Hook).
'If this prick keeps pissin me off then he's gettin a straight topside slap'

Jack - 'There was this right prick in the club last night'

Jon - 'Oh Yeah what did you do about it?'

Jack - 'Oh you know me, Just gave him a topside, that shut him up'

'Dont Watch That You'll Get a Topside' - Dizzee Rascal
Topside by Nicky_Blue_Eyes August 20, 2010
A personality trait that demonstrates strong decision-making skills or control, characteristic of homosexual males who prefer to be on top. Often valued by men who want to relax and not make choices (see, e.g. bottomy).
Where do you want to eat tonight?" "I'm not feeling like making decisions tonight. Just show me your topside and pick.
topside by @J_Cyrious July 13, 2011

topside pool piss 

Taking a leak directly into a pool, from the comfort of the pool deck when a bathroom or a secluded bush are just steps away. Usually a booze induced act, the topside pool piss is always met with harsh criticisim from angry onlookers who havent had nearly as many keg beers as the subject taking the piss.

Significance is doubled when Tim Tebow is swimming in said pool.
Ashley Cooke: Hey Cooper.. did you see that shitbombtaking a topside pool piss...??

Cooper: Yeah, what an asshole, he has no respect for this household.

topside browner 

What's left behind in a bathroom trash can from someone who just wiped their ass. Usually only done by wetbacks who, for some reason, choose to throw their wipings in a can, rather than flush them in a toilet. The topside browner will be facing up, showing the smear.
Dude, those fuckin wetbacks are always leavin behind some gnar ass topside browners.
topside browner by Yared Soyle January 4, 2007

topside spoon 

When a person lies face down flat and another person lies on top giving anal.
"Hey, I heard Rory and Kai did topside spoon last night and thought it was great fun."

OR

"You're topside spooning me right now!"
topside spoon by RHINO & CHAM December 2, 2016

topside mob 

a fucking lit ass rap group with songs like "thug it out"
Topside Mob is going to be better than trippie redd