sssfrs
An abbreviated version of "sassafras", a small deciduous tree. The only difference between this abbreviation and the common name of the tree sassafras is that the abbreviation does not contain any vowels. However, the only vowel in the word "sassafras" is the letter "a", three times, so the only letter that the abbreviation "sssfrs" truly lacks is thrice the letter "a".
"What kind of tree is that"
"its a sssfrs"
"what the heck"
"its a sssfrs"
"what the heck"