Heightfluid
A person whose height is not fixed and changes over time or depending on the situation.
Being heightfluid enables people to do a lot of things, such as riding on rides that you are not able to go on because of your height.
When James's date asked why he lied about being 6 ft, he told her he was heightfluid.
When James's date asked why he lied about being 6 ft, he told her he was heightfluid.