Whatsapp Spammer/Crasher

Hey guys does anyone know a tool or something how to crash whatsapp?

I have a 50.000 symbols message, which lets whatsapp stuck a lot, when I send this message 2-3 times to a user, he is offline for 5-10 minutes cause his whatsapp is crashing because it wants to load the message.

So my question, is there something where you can spam this message, without letting my own phone lagging and yea crashes the vitcim for a lot of hours?