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Performing sexual acts on a regular basis. Basically, having sex a lot.
ex.1) Frederico penetrated Lucy's vag everyday, hence they were slammin' on the reg.

ex.2) "Hey Charlie, where have ya been lately?"
"Oh hey Tom. I've been hanging out with Carol all week."
"Oh...so are you guys like slammin' on the reg now?"

"Basically...we fuck two times a day so I think it's legit."
by chickenfuckedandkat May 10, 2010