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3.
Refers to the brand/blog strapped-up.com.
Hey man! Did you see that new sweater Strapped UP put out? It's dope!

Yo Strapped UP had some sick posts today!
by Henksons February 17, 2013
 
1.
To put on a condom. Or keep weapons on your person
Sam: "Hey man, I hope you strapped up messing with that forest whore!"

Korey: "Oppsie daisy!"

Sam: "Damn man! Maybe you should lay off the drinking."

***************************************

Korey: "Oh shit watch out! Here they come!"

Sam: "Be cool man, I stay strapped up."
by Sam O November 16, 2006
 
2.
Keeping a weapon on yourself for self-defence.
"Out here if u ridin a car wid fo's, den u gotta be strapped up oderwise boys will jack"
by Rix_4356289 February 15, 2008