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Scottish slang. A Gumsy is a alternative way of describing a Blow Job.. i.e when a female sucks on a mans penis..
It possibly refers to a blowjob from a girl with no teeth, commonly found in numerous Glasgow schemes.
Stu: Hey baby, let me hit that sweet clunge of yours..
Random Girl: No you cant today, im on the blob..
Stu: How about a cheeky Gumsy then..?
Random Girl: OKAY!whap it out, It will be my pleasure..!
by StuAndrewz April 30, 2009