slang The breasts or one's cleavage. A pun on "the Grand Canyon" and mammary glands. Did she get a boob job? The Gland Canyon is much more noticeable these days.
Gland Canyon
n. the cleavage (between the breasts). (see also Mammary Lane.) I’d like nothing better than being lost in Gland Canyon.
yodeling in a canyon
in. talking aimlessly. You are just yodeling in a canyon if you think I really care about it.