Top Definition
1. Noun. A guitar amp consisting of an amp head and a 4x12 speaker cab.

2. Noun. A young guitar player who thinks that they know more than they do.
1. Hey dude! I just got a Mesa-Boogie Dual Rectifier Half-Stack!

2. Young Musician: Yeah, Line 6 Is way better than Marshall.

Experienced Musician: Kid, you've got a long way to go before you can say that.
by Kurt_F July 15, 2008
2 more definitions
A semi-erect penis.
"Yo, that phat ugly bitch aint even gone give me no none of a mo-fucking half-stack , bitch is straight stank-nasty."
by sand-hole February 16, 2009
Derived from the address "555 1/2 W Holland St.", along with a half stack amplifier metaphorically speaking, the Halfstack is the most amazing bachelor pad in the southeast region of South Dakota. Business offices below the apartment share the address "555 W Holland St.," thus the partial "1/2" comes into play. Apartment tenants go by the names "Josh" and "Kyler."
Dude, we gotta go to the Halfstack for a good jam session!

In verb form:
Joe is Halfstacking it up with his buddies.
by Joshua Harrison Ford October 15, 2010

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.