Top definition
When a man or a woman are heavily capable of issuing the most incredible sex you will ever receive. 'Top shag' is a title only appointed to those who have a reputation of being the utmost best in the sack. E.g. Nathan 'top shag' Smith was the best shag I've ever had!
Oh my good lord, that boy was a top shag!
by wigley worm June 03, 2014
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