up on your tit

when a friend or associate incessantly stalks you with a shitload of texts, emails and/or phone calls;

when somebody bugs you so much they're like a little baby crying for the tit

having to deal with an extremely high maintenance person

susan: what the hell, doesn't he get it? My phone is blowing up and he keeps facebooking me every 5 minutes

sandy: that dude is all up on your tit

susan: no shit