There are 4 basic ways to tell someone to ‘drop by sometime’ in Portuguese. I’ll offer a more or less literal translation into English for each one so you have an understanding of each phrase, although keep in mind, they are all just different ways to say “drop by sometime”.
Aparece lá em casa (qualquer dia) – Show up there at my house (one day)
Vê se aparece lá em casa (um dia desses) – See if you show up there at my house (one of these days)
Dá um pulo lá em casa (quando puder) – Hop on over there to my house (when you can)
Pode ir lá em casa (quando quiser) – You can go there to my house (when you wish)
Simply replace lá with aqui if you are already at home when you say the phrase.