buck noun
1 a non-Traveller man married to a Traveller woman 20-.
2 a person who decides to become a Traveller or someone with only one Traveller parent: Sandy learned the mouth organ from a wee [small] buck gadgie [man]... 20-. Compare blue buck etymology: possibly from the male animal; also collected by EMcC/PS; sense 1 also attested by JS, BW and DW; senses 1 and 2 attested by BS in TDITA note:

Forms buck, buckman and half buck attested by Canadian Paul Pope (2013) with the definition ‘non-Travellers on the road; a tramp’.