The key to keeping the mortar fluid and 'pumpable' lies in using the correct type and quantity of plasticisers. These along with other secret ingredients are what differentiates the really good gun injection mortars, such as Easipoint, from plain old sand and cement, and make the whole concept workable.
A boy gives his friend a holla on the phone. The definition of holla, or hollo, is a slang term meaning holler, which is a shout or call. An example of holla is giving someone a call on the phone; give them a holla. holla. holla.
A female, usually a teenager or young adult, who, when insulted, will reply verbally. This is typically achieved by insulting the original insulter (otherwise known as 'hollering back', shortened in this case to 'hollaback').