Get on the outside of that! 

By using the idea that if something is inside you, you are then outside of it. Commonly used for drinking buddies when the drink is placed in front of you for enthusiastic consumption.
Alternatively chicks could use it to describe a guy they fancy getting a length from

*Returning from the bar*
"Get on the outside of that Fella!"

*watching hot bloke walking by*
"hey girlfriend, wouldn't you just like to get on the outside of that!"

Get on the outside of that! by Wazgilbert May 4, 2008

Get on that horse 

To do something that needs to be done. An obvious opportunity that due to stupidity, laziness, or lack of awareness has gone unexploited.

That bangin' chick keeps asking about you. You better get on that horse.

I keep saying I'm going to get in shape but I never do. Time to get on that horse.

Get on that horse by bhffs January 7, 2011

get on my line

to get somebody to call you, you're line as in the phone where you talk to someone, usually used a lot on Facebook in statuses where people will want them to call them at night.

Person 1 Status- Aye, who tryna get on my line tonite?

Comments -
Person 2 - Oh me, what's your number
Person 1 - Imma inbox it to you.

get on my line by DMVHipster April 15, 2011

get on your horse 

to quicken a pace of walking

jog, or run

We have to get there quicker, get on your horse!

get on your horse by NotJaredFogle May 16, 2016

get on it 

to venture out with the intention of achieving absolute drunkedness.

any given Friday or Saturday night.

get on it by royce slaven May 5, 2003

get on the ball

The expression "get on the ball" is a phrase that was commonly used in the Ottawa Valley, Canada to mean "get with it". A local derivation often used was "get on the ball or get on the bus..." meaning "get with it" or "get out of here".

Get on the ball man; that happened last week!

get on the ball by SRFdeGriffintown March 9, 2018

get on your head

to beat someone up, very very very badly

If you don't stop talking ima get on your head

get on your head by sharee October 1, 2006