探头探脑

to stick one's head out and look around (idiom)

to explore / to search out / to scout / to visit / to stretch forward

to extend one's head (out or into) / a probe / detector / search unit

head / hair style / the top / end / beginning or end / a stub / remnant / chief / boss / side / aspect / first / leading / classifier for pigs or livestock / CL:個|个[ge4]

suffix for nouns

brain / mind / head / essence

erhua variant of 探頭探腦|探头探脑[tan4 tou2 tan4 nao3]