Hi folks
Aussie bloke it means
'Goodbye and may the road go with you'
Tuigean tu? (Do you understand?)
May the road go with you is isimilar to another which is
Go n'eiri an bothar leat (May the road rise to meet you)
Both of these simply mean may the path that lies ahead of you be easy and wothout trouble
Hope this helps
Lig do sath (Take it easy)
Mj