Definition of "untrimmed"

I'm so obsessedMy heart is bound to beat right out my untrimmed chest.

2009, Train (lyrics and music), “Hey, Soul sister”

The difference between the two classifications has always been intended to cover unblocked and untrimmed hat bodies, such as panamas, bangkoks, and leghorns, and other hats which are woven by the natives in South American and oriental countries where they are produced.

1918, Schedules M and N, free list, customs administration and income tax; subject index, page 1515