To "go to Finsbury Park" means to go all the way on a first date. It is implied that kissing, cuddling, conversation, dinner, touching, oral sex, spanking, reading and skinny-dipping are all skipped in favour of full-blown, uninhibited sex.
"How was your date last night?"

"Astonishing. I thought I might be allowed to cop a feel, but we went all the way to Finsbury Park!"
by HolyFerret November 14, 2007
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the female Barse, the bit between the snatch and the brown eye
when 'accidentaly'taking your lass "up the wrong'un" you have succeeded in 'Crossing the Finsbury bridge'

by Stugbat April 2, 2006
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also known as Finsbury Park, North London

A place in London, England, at the junction of the London Boroughs of Islington, Haringey and Hackney.
Guy on the phone on the No. 29 bus northbound:
"I'm on Seven Sisters... in Finsbury Dark..."
by silktransit April 7, 2006
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