Not so much a Scottish word as a Scottish phrase. My husband claims not to have heard this phrase before, I think he must have led a sheltered life. His mother’s mother was English though and that did mean that he wasn’t taught many Scottish words in the home.

Anyway, ‘a’ dodds a gled’ might possibly be Glaswegian rather than a phrase which is used all over Scotland. If someone says:
A wis a’ dodds a gled it means that they were very relieved about something that might have been worrying them. A literal translation is ‘I was all lumps of gladness’ or happiness.

So dodds means lumps or chunks and gled is obviously glad.