"Splanched" is a portmanteau word combining "spent" and "blanched". To say that someone is "splanched out" is to say he looks like he's been through the ringer; that he's pale, drawn, slightly unwell; like he's just undergone a draining personal ordeal; like he's just seen a ghost.
"Wow, have you seen Calvin? He just got back from Japan where he was searching the bins for old vinyl copies of Libby Titus' second album and he looks totally splanched out.
Prices shown in USD.