i guess so
A girl who thinks she's cool by saying 'LOL' every five seconds, but can't hold a real conversation. She says 'I guess so' like it's a fancy word and everyone else is stupid.
'You gonna finish that?' 'I guess so.' (She said it while laughing at a joke no one else got.)
'You wanna play video games?' 'I guess so.' (She was already on her phone.)
'You want to go to the movies?' 'I guess so.' (She was already texting her crush.)