H.O.

1) A specific type of model electric train. Known both as H.O. scale and H.O. gauge. The letters come from "Half-O", since H.O. was originally half the size of an O gauge train. The scale of H.O. is 1/67, and its gauge is 16.5mm. H.O. trains are the most popular size in the world.

2) the scale of H.O. trains, which is 1/87. It can eb applied to trains, minitaure figures, or model kits.

1) Jimmy has a set of H.O. trains running in his basement.

The Hobby Shop carries H.O. trains

2) Are those model plains 1/72 or H.O. scale?

This diorama is done to a precise H.O. scale.

by Tom from the Shore November 15, 2007

h.o

Abreviation Used in internet language meaning Hold on

Guy:"Hey can you tell what was todays homework?"
Girl:"h.o"
Guy: "ok"

by Keanu!!!! November 11, 2007

h.o.

an abbreviation for hold on

cutegirl101-can u h.o. 4 like 1 sec??
hotness123-ok
(in a chatroom)

by hvjvfhj,hcyhvcjlvchyk July 26, 2008

H.O.

A hard on
A Hard one
a guy that has a hard penis
a guy that pops a boner

"Sheez...Stacey when i talk to you i get an H.O." -J.R.

by Boobie Trap October 26, 2005

h.o money

Extra money usually cash kept secret and hidden by a women. From her man or husband.

Hey girl how did you get your nails done? I had h.o money

by Tesla2016 May 01, 2016

H.O

A half Ounce of weed

Yo fam I jus copped an H.O of weed

by vBlickz November 23, 2023