The material that lies between the testicles and the inner thigh of a human being.
"You have too much grumba for me to blow you."
"Your friend has a grumba look."
"Jesus told his disciples thou shall wash the grumba between thou's thighs."
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Normally used to name nice math teachers (which aren't a lot). Grumba teachers are nice at exams, likes to do some games during class and are the best teaching.
Teacher: Hello guys I love to play games with you all in the classes!
Student: Oh that is such a Grumba
Teacher: Hello class. Good news everyone aced the test!
Students: Omg Grumba you are the best!
Teacher: Hey, you understood everything?
Student: Yeah because you teach as a Grumba
Grr-u-m-ba
Oh my gosh
You might say grumba to someone being weird or
Why is your hair so crazy? Grumba.
Any living creatures underbelly. On Bipeds a grumba would be the waist.
I'm going to get you by the grumba.