Disemvoweling, disemvowelling (see doubled L), or disemvowelment of a piece of alphabetic text is rewriting it with all the vowel letters removed. This original sentence:

The quick brown fox jumps over the lazy dog

would, after being disemvowelled, look like this:

Th qck brwn fx jmps vr th lzy dg

Disemvoweling is a common feature of SMS language.