If you've ever eaten gummy bears, gummy just means rubber in German. They use the same word for elastic used in clothing, for example elastic waistband pants.
In my teens, me, my mother and a friend of the family went shopping together to pick up sewing supplies. The family friend walked through the store loudly asking "Where are the rubbers?" because she needed elastic for a sewing project of hers. My mother made herself very busy elsewhere in the store and did her best to pretend she didn't know the woman.
A different family friend had a vaginal yeast infection. Her doctor recommended a vinegar and water douche. Confused, she asked "How will that help? And how do I get the vinegar in the showerhead?" because it sounds like the German word for shower.
My high school French teacher was a tiny lady who spent a year of college abroad in Paris. At a fancy meal where they passed one course of food after another, she soon was too full to eat another bite. So she turned down the next course telling them "I'm full" in French (Je suis pleine.)
You could hear a pin drop and everyone was mortified because it roughly translated as "I'm knocked up!" Then they realized it was some weird Americanism and got on with dinner conversation.
A friend who lived in Spain or something for some years and was fluent in Spanish told me that the written word for year is the same as the written word for ass in Spanish, except year has a tilde over it. Since most English language keyboards don't let you put a tilde over a letter, "Happy New Year" fairly often becomes "Happy New Ass" on the internet, especially from people who aren't really fluent.
This sort of thing is incredibly common.