The Lumpenproletariat refers to families who do not regularly perform proper work.
Something to keep in mind is that Marx lived in a time before employment contracts were standard for Proletarians. Back then "Employee" often referred to a certain type of professional class person who sympathized with Scholars and Small Burghers. These are the days where a dozen people would just gather around workplaces - factories, ports, etc. - in the morning hoping to be given work.
Being temporarily unemployed, especially if you're getting unemployment checks, doesn't make you Lumpenproletarian. Being a NEET living in your mom's basement doesn't make you one, because class is largely determined at the family unit level. And this may be controversial, but IMO it also doesn't include alienated individuals who subsist on government subsidies, such as American Indians or the disabled - they would probably be considered a new sort of class that did not really exist in large numbers in Marx's time and he did not really articulate beyond their classes of origin.
So what is a Lumpenproletarian? The defining trait is that they merely subsist, and do so off of odd jobs, crime and begging. They might live in subsidized or group housing, or on the street or in abandoned properties. In olden times they probably washed cars and polished shoes to get by, but today they might do doordash deliveries. And of course there have always been street performers and prostitutes who would be considered Lumpenproletarian.
Today it might be a prostitute who lives in a rundown tenement trading sex for rent; a petty drug dealer getting by selling drugs on the street; a homeless begger who sleeps in the park and eats out of dumpsters.
As someone who has been in this situation before in my life, this class of people are often in this class for a reason - they're mentally ill, drug addicted, unstable, fugitive; while on an individual level some of them can contribute to the Socialist cause (as Marx says), their revolutionary potential is hampered by their difficulty in organization, much as was the case with the Peasantry.