"DSLAF" may be an accidental keyboard smash or a specific typo for a trending phrase (such as "DL" for down-low, or local acronyms) that caught fire because a high-profile account replicated it.
The most plausible explanation is that "dslaf" is a for a more established term. On a QWERTY keyboard: twitter dslaf hot
This exact cycle happened with “covfefe” (a Trump-era typo) and “smol” (intentional misspelling of “small”). could be the next micro-trend. "DSLAF" may be an accidental keyboard smash or