'Viens manger' is translated 'come eat' (imperative mood). This is a most common phrase at eight in the evening in French households.
Venez manger.(If you are talking to only one person, and you know them very well the you could say: viens manger.)
Je viens can mean I come, I am coming, but can also mean I just; je viens mangé - I just ate; je viens dormi - I just slept, je viens manger - I just eat.
viens me chercher, viens me prendre
viens le chercher, viens le prendre
"Je t'attends, viens" means "I'm waiting for you, come" in French.
Manger is the verb "to eat" in french.
viens le chercher, viens le prendre
tu viens d'où ? means 'where do you come from? ' in French.
where are you from mean d'où viens tu ? in french
d'où viens-tu, d'où est-ce que tu viens
'viens le chercher' or 'viens et prends-le / prends-la)
viens faire une balade, viens faire une excursion