Testipopping is when a adolescent boy's voice jumps or cracks while talking. This is usually seen as an embarrassing thing, as everyone will probably start laughing at you.
Teacher ~ "Class, can anyone tell me what the Chemical formula for water is?"

Boy ~ "<pop>YYeeesss</pop> Miss"
The "yes" part in this sentence is when the boy testipops in his enthusiasm to answer this nerdy question

Everyone laughs as the boy flushes in embarrassment.
by William Tseng March 17, 2008
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