Denshi Jisho — Online Japanese dictionary

腹ペコ はらペコ being hungry; starving
Noun 

You can also

Look up kanji details for 腹ペコ.

Try a Yahoo Jisho search for 腹ペコ .
Try a Goo Jisho search for 腹ペコ .
Try a Google search for 腹ペコ .