"haddest a looksee" is an informal expression that means taking a quick look or checking something out. There are several synonyms that can be used to convey the same meaning, such as glancing, peeking, peekabooing, scrutinizing, scanning, inspecting, investigating, perusing, and examining. Each of these terms conveys a slightly different nuance - peeping or peekabooing suggests a playful or sneaky approach, while scrutinizing or investigating carries a more serious tone. Regardless of which synonym is used, the intention is to take a brief look at something in order to gain a better understanding of it. So next time you want to say "haddest a looksee," try using one of these alternatives instead.