Definitions by FAKmyself

hilariousaurus rex

When a person laughs hard enough they pull both wrists to their chest and open their mouth while rocking back and fourth but stay in their own personal space. Similar to a velocilaughter.

That girl was laughing so hard she was doing the hilariousaurus rex

hilariousaurus rex by FAKmyself August 11, 2016

velocilaughter 

When some one holds two hands to their chest while laughing fiercely with their mouth open, as they lean towards you and try and touch you with the little arms they've made. They look similar to a velociraptor in this pose.

That girl became a velocilaughter when you told that joke.

velocilaughter by FAKmyself January 15, 2015