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The visible panty line that is formed on the backside of a pair of fullback (granny) panties by the gusset stitching, going from one butt cheek to the other.
Oh man, every time that Nancy bends over when in her yoga pants, you can see her bumstache!
Bumstache by Kah-Kah Bum June 18, 2016

yummyache 

A happy, persistent feeling in the stomach after a pleasant meal or snack
My boyfriend and I went out for ice cream...afterwards, I had such a yummyache!
yummyache by Anita1966 February 15, 2010

yummyache 

A stomachache that occurs after eating something painfully delicious.
Anthony: How were those donuts?
Nandita: Those donuts were so good that they gave me a yummyache.

bummyhead 

An insult used toward someone. A more polite way of saying "assface"
"Joe is a bummyhead"
bummyhead by Whodrankmymilk October 14, 2019

bullyache 

To whine in an aggressively-manipulative manner to try to pressure others to do your bidding.
The local rioffraff can bullyache to me all they want about needing emergency cash for some family-crisis --- I am NOT shelling out my hard-earned money just so that they can get their drugs or go on shopping-sprees!
bullyache by QuacksO March 8, 2019
When one has so much hair on ones anus, it looks like a mustache
Look, Fred has a bumstache
Bumstache by CharGeh May 25, 2010