When something is like something but not really. Having qualities of an object or situation, and yet at the same time not being the object or situation at all.
Sonny: Did you and the fat kid have a good time at the St. Patty's day parade?
Elise: We had a pseudo
good time, we couldn't get drunk and we got lost getting to southie
Tara: Did you cash in your bun tokens and have sex all over the house this weekend?
Elise: I had pseudo
sex this weekend...i fell asleep on top of him and we werent finished.