The honorable act of finishing (cumming) in someone of the other sex's hair. Usually accompanied by the scream "You're about to get top-decked bitch"
Ruby: I let Steve top-deck me last night
Jewel: You freaky bitch
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by Slap and tickle with the lads November 28, 2016
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Half head of dark coloured hair with light coloured hair on the top. Half and Half hair colour.
Many hairdressers wear their hair like this, dark underneath and blonde on top.

Reminiscient of a block of top deck!!
by DidiLeesh June 28, 2011
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