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spark plug 

Another name for a man's testes.
I was hoping to get lucky today, but my spark plugs are misfiring.
spark plug by jammyman December 31, 2009

spark plug 

(verb) when a sparky dances up on you, bends you over, and grinds your brains out
I was spark plugged last night and kind of liked it.
spark plug by Mista Mistaaa May 29, 2010

Spark plug 

When you insert a rod of tinfoil in your urethra, and proceed to insert your erect penis in a microwave.
Dude, after I lost that bet with Cassie she made me do a spark plug. I accidently set an African orphanage on fire.
Spark plug by sdascoli October 19, 2017

spark plug 

Another term for a tampon. Also may be refered to as a "plug."
"Honey, I gotta go buy some spark plugs...."
(Before sex...)"Honey, let me take out my plug first! "
spark plug by Crickett6969 June 15, 2008

spark plug 

A small amount of drugs (any drugs) that is passed in small paper bags out of fake mechanic shops.
I need to go to H&H Auto for a spark plug.
spark plug by oneeyelefty May 19, 2015

Spark Plug 

A spark plug is an electrical jumpstart to a rad brromance on an electric night.
Jim and Matthias were foolin' whereabouts a spark plug made something akin to a big bang I reckon
Spark Plug by Figure896 September 29, 2019