Top Definition
"Hitting reef" is a term that describes when a man's penis penetrates a woman's vagina and proceeds to make contact with the woman's cervix. The term is derived from nautical terminology, which describes a boat in shallow waters that has struck a coral reef.
"Dude, I got laid last night and for the first time I was hitting reef!"

"My girlfriends vagina is small, she is always complaining when I 'hit reef.'"
by I-wrote-sugar-cookie November 22, 2013

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