I suggested for this person to join us but they only know about SO.
Can a mod Shanghai them.
It's seems like more of a pirate thing here than Shanghai.
Only a moderator on the original site can migrate such a question. You have two options:
Flagging the question. The moderator will see this and can react appropriately. This may be annoying for some moderators, who may feel that you are stealing the questions from their site.
Commenting on the question. This is what you have done on the linked question. This then leaves the choice to migrate in the hands of the OP. It's also good advertisement for our site, so long as you do it wisely/sparingly.
As this cs.SE is an international site, it's probably a good idea to avoid using slang (especially relatively obscure slang). Otherwise people won't grok what you're saying.