In russian language, what does "pa" mean?
It is added to the head of verbs, for example, "pa-smatoriche" "pa-gabariche".

How change does the mean "pa-smtoriche" "pa-gabariche" from "smatoriche" "gabariche".?

Question

In russian language, what does "pa" mean? 
It is added to the head of verbs, for example, "pa-smatoriche" "pa-gabariche".

How change does the mean "pa-smtoriche" "pa-gabariche" from "smatoriche" "gabariche".?

Answer

I guess you mean prefix по- [po]
Посмотрите [posmotrite]
Поговорите [pogovorite]
perfective aspect
идти́ — to go (imperfective)
пойти́ — to go (perfective)
for a while, a little
говори́ть — to talk
поговори́ть — to have a talk, to talk a little

there is more information about prefix po http://learnrussian.rt.com/grammar-tables/verbs-of-motion-with-the-prefix-po/