不爱可以滚别给我这当孙子
[bù ài kĕ yĭ gŭn bié jĭ wŏ zhè dāng sūn zi]
This is a very informal and rude expression. The literal meaning implies that if someone doesn't care about them anymore, they should get lost and not act humbly or servilely toward the speaker. However, this expression might be taken as offensive in most situations.